Extreme cold weather operations are defined by a temperature, not a feeling: actions executed at twenty-five degrees below zero Fahrenheit or colder, treated as a subset of arctic operations. Below that line the doctrine stops being about comfort and starts being about equipment failure and casualty evacuation — radio batteries degrade, air evacuation may simply be unavailable, and arctic storms are fast-moving enough to kill the unprepared. Cold temperature zones then drive the required clothing layers.
Readers asked this on CheckMyRegs and CheckMyAFI 10 times — this page answers it from the official catalogs and the publications’ own text.
| Branch | Controlling publication | Dated | Source |
|---|---|---|---|
| Army | ATP 3-90.96 Current Arctic and extreme cold weather operations | 2025-02-24 | Official link |
| Marine Corps | MCTP 12-10E Current Marine Corps counterpart, same doctrinal text | 2025-02-24 | Official link |
| Army | AR 95-1 Current Army flight regulations, clothing for climatic conditions | 2018-03-22 | Official link |
| Navy | OPNAVINST 3710.7V Current Naval air training and operating procedures | 2016-11-22 | Official link |
Extreme cold weather operations are actions executed at twenty-five degrees below zero Fahrenheit or below, and are treated as a subset of arctic operations covering the skills needed to overcome those temperatures.
“1-12. Extreme cold weather operations are actions executed at -25 °F or below. Extreme cold weather operations are a subset of arctic operations that pertain to the various skills and techniques required to overcome low temperatures. Figure 1-2 depicts the regions in which U.S. forces conduct arctic and extreme cold weather operations in the northern hemisphere. Table 1-3 on page 28 describes cold temperature zones. Figure 1-2. Area of arctic and extreme cold weather operations The Arctic Environment Note. Terrain and climate regions are based on AR 70-38 classifications and U.S. Army Corps of Engineers Cold Regions Research and Engineering Laboratory data. The area of extreme cold weather operations depicts the region where temperatures at -25 °F or below can be expected annually. Mountainous regions may also experience extreme cold weather due to high altitude, even in dry, hot”… (paragraph continues in the PDF)
Cold temperature zones carry their own safety recommendations and required clothing layers — zone four runs from twenty-five to forty degrees below zero and is handled as extreme cold.
“Safety recommendations for cold temperature zone 4 Cold Temperature Zone 4: -25 to -40 ºF Extreme Cold Area of Consideration Special Requirements and Recommended Actions Available Personal Clothing and Equipment Clothing Layer: ECWCS Generation III: Base Layer Level I Lightweight cold weather undershirt/drawers and/or Level II Mid-weight cold weather shirt/drawers Insulating Layer Level III Fleece cold weather jacket Outer Shell Level V Soft shell jacket Level V Soft shell trousers Level VII Extreme cold weather parka (Worn in static positions; Available during movements) Level VII Extreme cold weather trousers (Worn in static positions; Available during movements) Other: • Issued wool socks with synthetic liner sock • Cold weather boots • White vapor barrier boots • Balaclava and neck gaiter • Double pane ski goggles • Spare balaclava, neck gaiter, mitten liners, socks available •”… (paragraph continues in the PDF)
Extreme cold impairs the electrical components in radio sets and significantly degrades the dry-type primary batteries that power portable radios and much of the test equipment used to repair signal gear.
“4-32. Extreme cold impairs the operation of electrical components which make up radio sets . Such cold significantly impairs dry-type primary batteries used to power the small carried portable radios and many test instruments used to repair signal equipment. To minimize the effects of cold on dry-type batteries, troops use only those batteries designed for cold weather operations for arctic operations. Dry batteries, if kept warm at low ambient temperatures, deliver satisfactory service life. Troops can keep batteries warm by carrying them inside clothing, using insulated containers, or using heating devices to provide a warm temperature for the battery. These techniques work so long as the battery temperature does not exceed 100 °F. (See Appendix A for temperature conversions.)”
Air evacuation is normally the most practical route for a casualty, but weather and extreme cold can remove that option, with deep snow and a shortage of suitable landing zones forcing hoist operations.
“8-107. When feasible, the most practical means of patient evacuation is by air. However, air evacuation may be unavailable due to weather and extreme cold temperatures. Deep snow and limited areas for suitable LZs often require hoist operations. Aircraft resupplying a forward unit can also carry patients on the return trip.”
Arctic storms tend to be fast-moving and violent and can kill the unprepared, which is why the environment shapes operations here more than in any other setting.
“1-89. The extremes of arctic weather strongly impact all factors of an OE and shape operations —perhaps more so than any other environment. Arctic storms tend to be fast -moving and violent and can hinder or kill those who are unprepared. Units must be prepared to self -sustain for several days during and after a storm. Additionally, many weather phenomena exist only in the Arctic. Relative advantages for Soldiers and Marines come from integration with the staff weather officer (SWO) /meteorology and oceanography (METOC) officer , who enhances weather interpretation and assigns tactical meaning to it. However, Soldiers and Marines should not solely rely on the SWO /METOC . They must also be familiar with arctic weather patterns in the event they become isolated without reliable communications and cannot receive weather and intelligence updates from analysts. Note. For all mentions of”… (paragraph continues in the PDF)
Arctic weather changes rapidly, so a commander with staff weather officers who can accurately forecast sudden change holds a real advantage over one who cannot.
“3-5. Weather, extreme cold, wetlands, forested areas, and snow cover make up the physical environment factors. Arctic weather is subject to rapid changes. The commander with SWOs/METOCs who can accurately forecast sudden changes in the weather has a distinct advantage over enemy forces. The importance of local weather forecasting capability cannot be overemphasized. Changes include extreme temperature shifts, snowstorms, strong winds, and dense fog. Changes may be sudden but must be anticipated. Effective units exploit favorable conditions to the maximum, even if they only last for a short period. During winter, the extreme cold affects all operations by making them more difficult and take longer. Operations often take two to four times longer than they would in a temperate environment. Proper clothing and equipment are an absolute necessity and must be acquired and trained on well in”… (paragraph continues in the PDF)
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Updated 2026-08-01. CheckMyRegs is an unofficial index — always cite the official publication.