to Cold-Weather Operations DIFFERENT TYPES OF COLD CONDITIONS 1-1. There are different types of cold found throughout the world and each presents its own challenges. For Soldiers to be effective in a cold-weather environment, it is essential they first understand the effects of cold on the body and equipment. (See ATP 3-90.97 for more information.) 1-2. Weather is considered to be cold when the temperature registers 39 degrees (°) Fahrenheit (F) or Celsius (C) above (+) zero and drops to negative (–) 40°F or lower. The Army groups cold temperatures into five categories: • Temperature zone I (wet cold): to + 20°F (4°C to –7°C). • Temperature zone II (dry cold): to to –20°C). • Temperature zone III (intense cold): to (–20°C to –32°C). • Temperature zone IV (extreme cold): to (–32°C to –40°C).
DesignationTC 21-3
EditionSep 2025
StatusActive
ProponentTRADOC
Pages136
FunctionFieldcraft Survival
CollectionCurrent Doctrine
Approved for public release; distribution is unlimited. This publication supersedes TC 21-3, dated 17 March 1986. HEAD