{"id":8638,"date":"2026-01-15T00:00:11","date_gmt":"2026-01-15T00:00:11","guid":{"rendered":"http:\/\/yubeen-header-clone.local\/?p=8638"},"modified":"2026-09-16T15:59:46","modified_gmt":"2026-09-16T07:59:46","slug":"the-science-of-detection-how-thermal-imaging-scopes-work-in-extreme-weather","status":"publish","type":"post","link":"https:\/\/www.yubeen.com\/pt\/news\/the-science-of-detection-how-thermal-imaging-scopes-work-in-extreme-weather\/","title":{"rendered":"How Weather Affects Thermal Imaging: Fog, Rain, Snow, and Cold Explained"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Understanding how weather affects thermal imaging is important because fog, rain, humidity, snow and cold can all change thermal contrast and practical detection range.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thermal imaging does not depend on visible illumination, which is why it can remain useful when conventional optics become difficult to use after sunset or in complete darkness.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Weather, however, is a different issue.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fog, rain, humidity, snow, cold air, and changing surface temperatures can all affect the infrared energy traveling from the scene to the detector. Some conditions reduce atmospheric transmission. Others reduce the thermal contrast between a target and its background. Water on the lens can introduce another layer of image degradation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The result is that thermal imaging often remains useful in conditions where visible imaging struggles, but it should not be described as unaffected by weather.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you are comparing complete products rather than environmental behavior alone, start with our guide on <strong><a href=\"\/pt\/noticias\/how-to-choose-a-thermal-imaging-scope-which-specs-matter-most-in-2026\/\" data-type=\"link\" data-id=\"\/news\/how-to-choose-a-thermal-imaging-scope-which-specs-matter-most-in-2026\/\">how to choose a thermal imaging scope<\/a><\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Thermal Imaging Works Without Visible Light<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Conventional visible-light optics depend on light being reflected from the scene and entering the eye or camera.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thermal imaging works differently.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Objects above absolute zero emit electromagnetic radiation, including infrared radiation. A thermal detector records differences in the infrared energy reaching the focal plane and converts those differences into image data.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Many uncooled thermal imagers operate in the long-wave infrared region, commonly associated with approximately 7\u201314\u03bcm detector response, while atmospheric transmission is particularly useful in portions of the LWIR window around 8\u201312\u03bcm.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because this process does not require visible illumination, darkness itself does not prevent thermal image formation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But infrared energy still has to pass through the atmosphere before it reaches the detector.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That distinction is the key to understanding weather performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For more on the detector and focal plane itself, see our guide to <strong><a href=\"\/pt\/noticias\/a-fisica-do-fpa-compreender-a-resolucao-do-microbolometro-e-a-taxa-de-atualizacao-em-miras-de-imagem-termica\/\" data-type=\"link\" data-id=\"\/news\/the-physics-of-fpa-understanding-microbolometer-resolution-and-refresh-rate-in-thermal-imaging-scopes\/\">thermal imaging FPA and microbolometers<\/a><\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The Atmosphere Is Part of the Imaging System<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A thermal imager does not receive all of the infrared energy emitted by a distant target.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Some energy is absorbed or scattered by the atmosphere, while the atmosphere itself also contributes infrared radiation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The longer the path between target and detector, the more atmospheric conditions can matter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Relative humidity, atmospheric temperature, aerosols, fog droplets, rain, snow, and other obscurants can all change effective transmission.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FLIR&#8217;s radiometric guidance explicitly treats distance, atmospheric temperature, and relative humidity as variables that can affect the infrared signal reaching a camera.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why a quoted detection range measured in clear, dry conditions should not automatically be expected in heavy fog or rain.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fog: Thermal Can Outperform Visible Light, but It Does Not \u201cSee Through\u201d Fog<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Fog is made of suspended water droplets.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Visible light is strongly scattered by those droplets, which is why headlights and conventional cameras can perform poorly in fog.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thermal infrared can perform better under some fog conditions because transmission in the LWIR band can be more favorable than transmission in the visible band.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That advantage is real.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But it has limits.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FLIR&#8217;s atmospheric modeling shows that thermal imaging can outperform visible imaging in lighter and moderate fog, while dense fog can reduce the advantage dramatically. Under sufficiently dense fog, atmospheric transmission itself becomes the dominant limitation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Therefore the technically accurate statement is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">thermal imaging may retain useful range in some fog conditions where visible imaging is more severely degraded.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Not:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">thermal imaging sees through fog.<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">Fog Density Matters<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">There is no single \u201cfog performance\u201d value.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fog differs in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>droplet size;<\/li>\n\n\n\n<li>droplet density;<\/li>\n\n\n\n<li>aerosol type;<\/li>\n\n\n\n<li>humidity;<\/li>\n\n\n\n<li>climate;<\/li>\n\n\n\n<li>atmospheric path length.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A light mist and a dense fog bank are not equivalent optical environments.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why comparing products from one fog photograph can be misleading unless the conditions are controlled.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Humidity Can Reduce Long-Range Transmission<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Even without visible fog, humid air can affect infrared transmission.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Water vapor has strong infrared absorption characteristics, and transmission loss becomes increasingly important over longer paths.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FLIR notes that higher humidity can increase atmospheric attenuation and that clear, dry winter conditions can provide better long-range transmission than humid conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For short distances, the effect may be relatively small.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At longer distances, especially when target contrast is already weak, atmospheric attenuation becomes more important.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is one reason long-range thermal performance cannot be predicted from detector resolution alone.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Rain Reduces Contrast in More Than One Way<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Rain can affect thermal imaging through several mechanisms.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">First, raindrops and moisture in the atmospheric path can scatter and absorb infrared energy, reducing target-to-background contrast.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Second, rain changes the thermal state of surfaces.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Wet ground, vegetation, structures, and animals can move toward similar surface temperatures, reducing thermal contrast even when the detector itself is functioning normally.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Third, water droplets on the front lens can degrade image quality.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FLIR notes that the effect of water droplets on a thermal lens depends on factors including coverage, focus position, and focal length.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This means heavy rain should not be described as merely a software problem that can be \u201ccorrected\u201d by image enhancement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Some of the information has physically been reduced before it reaches the detector.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Snow Has Both Contrast Advantages and Transmission Limits<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Snow-covered environments can sometimes produce strong thermal contrast.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fresh snow is often much colder than warm animals, people, machinery, or recently heated objects.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That can make warm targets stand out clearly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, snow does not guarantee strong performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Falling snow introduces particles into the atmospheric path.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Wet snow and moisture can change surface temperatures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Accumulated snow may hide parts of an object.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And snow or moisture on the lens can reduce image quality.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The useful question is therefore not:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cDoes thermal work in snow?\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">but:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cHow much usable target contrast reaches the detector under the actual snow, moisture, distance, and temperature conditions?\u201d<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Cold Weather Can Increase Contrast\u2014but Can Also Stress the Device<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cold environments can sometimes improve target-to-background contrast when the target remains substantially warmer than its surroundings.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FLIR notes that colder ambient conditions can increase temperature difference between a warmer target and its environment under some circumstances.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But cold-weather imaging also introduces practical issues.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Battery performance can fall at low temperatures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Displays and electronics may have specified operating limits.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Rapid transitions between warm and cold environments can cause detector drift or condensation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For this reason, the exact operating-temperature specification of the product still matters.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Do not assume every thermal device behaves identically in sub-zero conditions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Rapid Temperature Changes Can Affect Image Stability<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Moving a thermal device quickly between significantly different ambient temperatures can temporarily change detector and housing temperatures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That can affect calibration and image stability until the system reaches a more stable thermal condition.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FLIR specifically notes that rapid transitions from warm to cold or cold to warm can produce temperature drift and detector-response changes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For observational thermal optics, the exact behavior depends on the hardware and calibration strategy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is one reason field performance should be judged after the device has stabilized rather than immediately after a large environmental transition.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Thermal Contrast Can Disappear Even in Clear Weather<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bad weather is not the only reason a thermal image can become difficult to interpret.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A clear scene can still have low thermal contrast.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, after prolonged solar heating, ground, vegetation, rocks, and structures may approach similar apparent surface temperatures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Around environmental transitions, the target and background can sometimes become thermally similar.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When that happens, scene contrast falls even though the atmosphere is clear.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is sometimes informally described as <strong>thermal crossover<\/strong> or low-contrast thermal conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The important point is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">thermal image quality depends on temperature contrast as well as atmospheric transmission.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">NETD Matters Most When Contrast Is Weak<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">NETD describes thermal sensitivity relative to system noise.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When a target is much warmer or colder than the background, contrast is already strong.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When target and background temperatures are close, smaller thermal differences become harder to preserve.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A lower NETD can help the imaging system distinguish weaker thermal differences under comparable measurement conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But lower NETD does not eliminate atmospheric attenuation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It cannot recreate infrared information that fog, rain, or another obstruction prevented from reaching the detector.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a full explanation, see<a href=\"\/pt\/noticias\/netd-in-thermal-imaging-why-18mk-is-the-new-gold-standard-for-hunters-in-2026\/\" data-type=\"link\" data-id=\"\/news\/netd-in-thermal-imaging-why-18mk-is-the-new-gold-standard-for-hunters-in-2026\/\"> <strong>NETD in thermal imaging<\/strong><\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Detector Resolution Still Matters in Bad Weather<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Atmospheric degradation and thermal sensitivity do not remove the need for spatial detail.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Detector resolution determines how many native spatial samples are available.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A higher-resolution detector can provide more spatial information when optical conditions and field of view are comparable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But degraded atmosphere can reduce target contrast before that information reaches the detector.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This means:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">more pixels cannot completely compensate for poor atmospheric transmission.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Likewise:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">strong atmospheric transmission does not compensate for insufficient spatial sampling.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">The two factors solve different problems.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pixel Pitch Does Not Make a Device Weather-Proof<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pixel pitch influences detector geometry and angular sampling.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It does not determine atmospheric transmission.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A 12\u03bcm detector does not automatically perform better in fog than a 17\u03bcm detector.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Weather performance still depends on:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>wavelength band;<\/li>\n\n\n\n<li>atmosphere;<\/li>\n\n\n\n<li>optics;<\/li>\n\n\n\n<li>detector sensitivity;<\/li>\n\n\n\n<li>resolution;<\/li>\n\n\n\n<li>focal length;<\/li>\n\n\n\n<li>field of view;<\/li>\n\n\n\n<li>processing;<\/li>\n\n\n\n<li>target contrast.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Pixel pitch should therefore not be used as a shortcut for weather capability.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Lens Quality and F-Number Still Matter<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The objective lens determines how much useful infrared energy reaches the detector.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lens transmission, focal length, focus quality, coatings, and f-number all influence the signal delivered to the focal plane.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In difficult conditions, where the available target signal may already be reduced, poor optical transmission becomes even more significant.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This does not mean one lens specification can overcome bad weather.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It means the optical system remains part of the total performance chain.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Water, Condensation, and the Front Lens Matter<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Weather does not affect only the atmosphere between the target and the device.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It can also affect the optics directly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Water droplets, condensation, frost, mud, or snow on the objective surface can reduce image quality.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FLIR&#8217;s technical guidance notes that the impact of water droplets depends partly on focus and focal length, as well as how much of the lens is covered.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is a practical maintenance issue rather than a detector specification.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Keep the front optic clean according to the manufacturer&#8217;s instructions and avoid wiping abrasive debris across the surface.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Image Processing Can Help\u2014but It Cannot Restore Missing Signal<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Modern thermal devices may apply:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>non-uniformity correction;<\/li>\n\n\n\n<li>automatic gain control;<\/li>\n\n\n\n<li>noise reduction;<\/li>\n\n\n\n<li>local contrast enhancement;<\/li>\n\n\n\n<li>sharpening;<\/li>\n\n\n\n<li>temporal filtering;<\/li>\n\n\n\n<li>super-resolution or other advanced processing.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These functions can improve the presentation of weak thermal information.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But software operates on data that has already reached the detector.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If severe fog or rain has attenuated much of the useful target signal, processing cannot reconstruct every lost physical measurement with certainty.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why claims such as:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cAI removes fog\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">or:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cimage enhancement restores full range in rain\u201d<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">should be treated cautiously.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For more on computational enhancement, see <strong><a href=\"\/pt\/noticias\/the-rise-of-ai-in-thermal-scopes-how-neural-processing-units-npu-are-redefining-clarity\/\" data-type=\"link\" data-id=\"\/news\/the-rise-of-ai-in-thermal-scopes-how-neural-processing-units-npu-are-redefining-clarity\/\">AI processing in thermal scopes<\/a><\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Display Quality Does Not Change Atmospheric Transmission<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A high-resolution OLED can make the processed image easier to view.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It does not change the infrared signal that passed through the atmosphere.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Likewise, changing palette or display contrast can make certain details easier to see without changing the underlying detector data.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Display quality matters to usability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It should not be confused with weather penetration or detector sensitivity.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Weather Can Change DRI Range<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Detection, recognition, and identification all depend on usable target information.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Weather can reduce that information by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>attenuating infrared radiation;<\/li>\n\n\n\n<li>reducing target-to-background contrast;<\/li>\n\n\n\n<li>obscuring parts of the target;<\/li>\n\n\n\n<li>degrading lens transmission;<\/li>\n\n\n\n<li>adding noise or clutter to the scene.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">As a result, the practical DRI range in fog or heavy rain can be shorter than a range measured under clear conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why detection-range specifications should be interpreted together with the conditions under which they were calculated or tested.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For the full DRI discussion, see our guide to <strong><a href=\"\/pt\/noticias\/how-far-can-a-thermal-imaging-rifle-scope-see-detection-recognition-and-identification-explained\/\" data-type=\"link\" data-id=\"\/news\/how-far-can-a-thermal-imaging-rifle-scope-see-detection-recognition-and-identification-explained\/\">thermal detection, recognition, and identification<\/a><\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Specifications Matter Most in Difficult Weather?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Weather performance is a system result.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/www.yubeen.com\/wp-content\/uploads\/2026\/09\/thermal-imaging-weather-effects-guide-1024x640.webp\" alt=\"Diagram summarizing how fog, rain, humidity, snow, and cold affect thermal imaging\" class=\"wp-image-8868\" srcset=\"https:\/\/www.yubeen.com\/wp-content\/uploads\/2026\/09\/thermal-imaging-weather-effects-guide-1024x640.webp 1024w, https:\/\/www.yubeen.com\/wp-content\/uploads\/2026\/09\/thermal-imaging-weather-effects-guide-300x188.webp 300w, https:\/\/www.yubeen.com\/wp-content\/uploads\/2026\/09\/thermal-imaging-weather-effects-guide-768x480.webp 768w, https:\/\/www.yubeen.com\/wp-content\/uploads\/2026\/09\/thermal-imaging-weather-effects-guide-1536x961.webp 1536w, https:\/\/www.yubeen.com\/wp-content\/uploads\/2026\/09\/thermal-imaging-weather-effects-guide-18x12.webp 18w, https:\/\/www.yubeen.com\/wp-content\/uploads\/2026\/09\/thermal-imaging-weather-effects-guide-600x375.webp 600w, https:\/\/www.yubeen.com\/wp-content\/uploads\/2026\/09\/thermal-imaging-weather-effects-guide.webp 1586w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Useful specifications and characteristics include:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Factor<\/th><th>Why it matters in poor conditions<\/th><\/tr><\/thead><tbody><tr><td>NETD<\/td><td>Helps preserve small thermal differences relative to noise<\/td><\/tr><tr><td>Detector resolution<\/td><td>Determines available spatial samples<\/td><\/tr><tr><td>Lens transmission<\/td><td>Influences how much infrared energy reaches the detector<\/td><\/tr><tr><td>F-number<\/td><td>Influences optical throughput and system sensitivity<\/td><\/tr><tr><td>Focal length \/ FOV<\/td><td>Determines scene coverage and angular target sampling<\/td><\/tr><tr><td>Focus<\/td><td>Affects how effectively detail reaches the detector<\/td><\/tr><tr><td>Image processing<\/td><td>Can improve presentation of weak or noisy data<\/td><\/tr><tr><td>IP rating<\/td><td>Describes environmental sealing for the exact product<\/td><\/tr><tr><td>Operating temperature<\/td><td>Defines the supported ambient range<\/td><\/tr><tr><td>Battery system<\/td><td>Affects practical runtime, especially in cold weather<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">No single row guarantees strong bad-weather performance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Environmental Ratings Are Product-Specific<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">It is reasonable to check IP rating, operating temperature, storage temperature, and mechanical durability for field equipment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But these specifications must be taken from the exact current model.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Do not assume that every product in a range has:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>the same IP rating;<\/li>\n\n\n\n<li>the same cold-weather limit;<\/li>\n\n\n\n<li>the same shock rating;<\/li>\n\n\n\n<li>the same battery behavior.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">And avoid vague terms such as \u201cweather-proof\u201d or \u201cmilitary-grade\u201d unless a defined standard supports them.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For broader ownership and handling issues, see our guide to <strong><a href=\"\/pt\/noticias\/battery-drain-to-zero-loss-5-thermal-scope-mistakes-ruining-your-night-hunts\/\" data-type=\"link\" data-id=\"\/news\/battery-drain-to-zero-loss-5-thermal-scope-mistakes-ruining-your-night-hunts\/\">thermal scope reliability<\/a><\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A Real Product Still Needs to Be Judged as a Complete System<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A thermal product used in wet, cold, foggy, or low-contrast conditions should be evaluated from the full system rather than one headline specification.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Detector resolution determines spatial sampling.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">NETD influences sensitivity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The lens controls infrared transmission and viewing geometry.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Atmospheric conditions determine how much target signal survives the path.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Image processing affects how the data is presented.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And the enclosure, battery, and operating-temperature design determine whether the device remains practical in the environment.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/www.yubeen.com\/wp-content\/uploads\/2026\/09\/ST35Pro_04-1024x682.webp\" alt=\"Current Yubeen thermal imaging product shown as a field-use example\" class=\"wp-image-8713\" srcset=\"https:\/\/www.yubeen.com\/wp-content\/uploads\/2026\/09\/ST35Pro_04-1024x682.webp 1024w, https:\/\/www.yubeen.com\/wp-content\/uploads\/2026\/09\/ST35Pro_04-300x200.webp 300w, https:\/\/www.yubeen.com\/wp-content\/uploads\/2026\/09\/ST35Pro_04-768x512.webp 768w, https:\/\/www.yubeen.com\/wp-content\/uploads\/2026\/09\/ST35Pro_04-1536x1024.webp 1536w, https:\/\/www.yubeen.com\/wp-content\/uploads\/2026\/09\/ST35Pro_04-18x12.webp 18w, https:\/\/www.yubeen.com\/wp-content\/uploads\/2026\/09\/ST35Pro_04-600x400.webp 600w, https:\/\/www.yubeen.com\/wp-content\/uploads\/2026\/09\/ST35Pro_04.webp 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A current Yubeen thermal imaging product should therefore be evaluated from its verified detector, optics, environmental ratings, power system, and intended application rather than from a general \u201call-weather\u201d claim.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Evaluate Thermal Performance in Bad Weather<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When comparing devices, use this sequence:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Define the weather condition.<\/strong><br>Light fog, dense fog, rain, snow, humidity, and cold are different problems.<\/li>\n\n\n\n<li><strong>Define the expected distance.<\/strong><br>Atmospheric loss increases with path length.<\/li>\n\n\n\n<li><strong>Check target size and thermal contrast.<\/strong><br>A large, high-contrast target is easier than a small low-contrast one.<\/li>\n\n\n\n<li><strong>Compare native detector resolution.<\/strong><br>Do not confuse display resolution with detector resolution.<\/li>\n\n\n\n<li><strong>Check NETD under stated conditions.<\/strong><br>Sensitivity can matter strongly in low-contrast scenes.<\/li>\n\n\n\n<li><strong>Check lens and field of view.<\/strong><br>Viewing geometry still controls target sampling.<\/li>\n\n\n\n<li><strong>Check current environmental ratings.<\/strong><br>IP and operating-temperature limits must belong to the exact model.<\/li>\n\n\n\n<li><strong>Look at lens exposure.<\/strong><br>Rain, snow, condensation, or contamination on the front optic can affect image quality.<\/li>\n\n\n\n<li><strong>Treat image processing separately.<\/strong><br>Processing may improve presentation but cannot eliminate atmospheric attenuation.<\/li>\n\n\n\n<li><strong>Compare field results only under similar conditions.<\/strong><br>Two screenshots taken in different weather are not a controlled comparison.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">What Thermal Imaging Can\u2014and Cannot\u2014Do in Bad Weather<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A useful summary is:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Thermal imaging can:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>operate without visible illumination;<\/li>\n\n\n\n<li>retain useful contrast in some fog, rain, or snow conditions;<\/li>\n\n\n\n<li>outperform visible imaging in certain low-visibility environments;<\/li>\n\n\n\n<li>reveal small thermal differences when detector sensitivity is sufficient.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Thermal imaging cannot:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>make dense fog transparent;<\/li>\n\n\n\n<li>see through solid vegetation or other opaque objects;<\/li>\n\n\n\n<li>eliminate atmospheric attenuation;<\/li>\n\n\n\n<li>guarantee the same range in every weather condition;<\/li>\n\n\n\n<li>recover physical signal that never reached the detector.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This distinction is more useful than calling thermal imaging \u201call-weather.\u201d<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">FAQ<\/h2>\n\n\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list\">\n<div id=\"faq-question-1789031059123\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question\"><strong>Can Thermal Imaging Work in Complete Darkness?<\/strong><\/h3>\n<div class=\"rank-math-answer\">\n\n<p>Yes. Thermal imaging does not require visible illumination because it detects infrared radiation from the scene. However, useful image contrast still depends on differences in thermal signal between objects and backgrounds.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1789031066082\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question\"><strong>Can Thermal Imaging See Through Fog?<\/strong><\/h3>\n<div class=\"rank-math-answer\">\n\n<p>Sometimes it can outperform visible imaging in light or moderate fog, particularly in the LWIR band. Dense fog can still strongly attenuate infrared radiation and reduce range, so \u201csee through fog\u201d is too absolute.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1789031072922\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question\"><strong>Does Rain Stop Thermal Imaging From Working?<\/strong><\/h3>\n<div class=\"rank-math-answer\">\n\n<p>Not necessarily, but rain can reduce atmospheric transmission, lower target-to-background contrast, and place water on the front lens. Heavy rain can therefore shorten practical range and reduce image quality.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1789179664377\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question\">Does Snow Improve Thermal Contrast?<\/h3>\n<div class=\"rank-math-answer\">\n\n<p>It can when warm targets are viewed against a cold snow-covered background. Falling snow, wet surfaces, atmospheric loss, and lens contamination can still reduce performance.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1789179678729\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question\">Is Cold Weather Better for Thermal Imaging?<\/h3>\n<div class=\"rank-math-answer\">\n\n<p>Cold backgrounds can sometimes increase thermal contrast for warmer targets, but cold weather can also affect batteries, electronics, condensation, and device operating limits. The exact product specification should be checked.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1789179685153\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question\">Does Lower NETD Make a Thermal Scope Weather-Proof?<\/h3>\n<div class=\"rank-math-answer\">\n\n<p>No. Lower NETD can help distinguish weaker thermal differences under comparable conditions, but it cannot eliminate atmospheric attenuation or physical obstruction.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>Learn how fog, rain, humidity, snow, and cold affect thermal imaging\u2014and why atmosphere, contrast, optics, NETD, and device design all matter.<\/p>","protected":false},"author":1,"featured_media":8867,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[87],"tags":[],"class_list":["post-8638","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology-guides"],"_links":{"self":[{"href":"https:\/\/www.yubeen.com\/pt\/wp-json\/wp\/v2\/posts\/8638","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yubeen.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yubeen.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yubeen.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yubeen.com\/pt\/wp-json\/wp\/v2\/comments?post=8638"}],"version-history":[{"count":4,"href":"https:\/\/www.yubeen.com\/pt\/wp-json\/wp\/v2\/posts\/8638\/revisions"}],"predecessor-version":[{"id":9041,"href":"https:\/\/www.yubeen.com\/pt\/wp-json\/wp\/v2\/posts\/8638\/revisions\/9041"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.yubeen.com\/pt\/wp-json\/wp\/v2\/media\/8867"}],"wp:attachment":[{"href":"https:\/\/www.yubeen.com\/pt\/wp-json\/wp\/v2\/media?parent=8638"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yubeen.com\/pt\/wp-json\/wp\/v2\/categories?post=8638"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yubeen.com\/pt\/wp-json\/wp\/v2\/tags?post=8638"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}