When it is cold outside meteorologists will sometimes use a term called "windchill" to describe the temperature conditions.
"Windchill temperature is how cold people and animals feel when outside," according to a response on the National Weather Service website to frequently asked questions about windchill.
The human body produces heat, but wind can move that heat from the body. A windchill calculation tries to determine the temperatures a person experiences due to that interaction. Windchill "is based on the rate of heat loss from exposed skin caused by wind and cold," according to NWS info.
Air temperature and wind speed are two of several things measured as part of a windchill calculation.
Windchill can speed up the cooling of an inanimate object, but will not cool it below air temperature, according to one response to a question NWS is frequently asked about windchill.
Frostbite and hypothermia are both risks humans face from exposure to cold. Frostbite is a term for frozen body tissue. Hypothermia describes a dangerous condition that takes place when the body temperature drops below 95 degrees.
Multiple layers of loose, lightweight, warm clothing are effective at keeping someone warm in cold weather because air trapped between layers will help insulate from the cold. NWS recommends tightly woven, water repellent, hooded outer garments.