Wind Chill Calculator
Calculate wind chill temperature using the official NWS formula. See frostbite risk, hypothermia danger level, and clothing recommendations. Works with °F/°C, mph/km/h/knots/m/s.
Wind Chill
Feels like temperature
Risk of frostbite on exposed skin in 30+ minutes. Wear hat, gloves, and layers.
Actual Temp
20°F
Feels Colder By
-14°
Clothing Recommendation
Heavy winter coat, insulated gloves, hat, scarf
Both Units
Wind Chill Temperature Chart
How cold it really feels based on temperature and wind speed (NWS formula).
Colors indicate danger level. Red = extreme danger, purple = dangerous, blue = cold.
How to Use the Wind Chill Calculator
Enter Temperature and Wind
Input the current air temperature in Fahrenheit or Celsius, and wind speed in mph, km/h, knots, or m/s. Use the preset buttons for quick entry or type exact values. The formula is valid for temperatures at or below 50°F (10°C) and wind speeds of 3+ mph.
Read the Wind Chill Result
The calculator shows the feels-like temperature, danger level (from Comfortable to Extreme Danger), and how many degrees colder it feels than the actual temperature. Color coding makes the severity immediately visible.
Check Safety Information
See frostbite time estimates, hypothermia risk level, and specific clothing recommendations for the conditions. Toggle the full NWS wind chill chart to see how different temperature and wind combinations compare.
Why Use Our Wind Chill Calculator
Official NWS Formula
Uses the 2001 NWS/Environment Canada wind chill temperature index - the same formula used by weather services worldwide.
Frostbite Risk Assessment
See estimated frostbite time in minutes and hypothermia risk level. Know exactly when conditions become dangerous.
4 Wind Speed Units
Enter wind in mph, km/h, knots, or m/s. Results show both Fahrenheit and Celsius regardless of input units.
Motorcycle Wind Chill
Your riding speed equals wind speed for wind chill. See how highway speeds make mild temperatures dangerous on a bike.
Clothing Recommendations
Get specific gear advice from light jacket to full arctic gear based on the calculated wind chill temperature.
Full Wind Chill Chart
Toggle the complete NWS wind chill reference table showing every temperature and wind speed combination.
Complete Guide to Wind Chill: Science, Safety, and Survival
What Is Wind Chill and Why Does It Matter?
Wind chill temperature represents how cold the air feels on exposed human skin. Your body constantly radiates heat, creating a thin warm air layer against your skin. In calm conditions, this insulating layer slows heat loss. Wind disrupts this barrier, accelerating heat transfer from your body to the environment. The faster the wind, the faster you lose body heat.
This matters because hypothermia and frostbite depend on how fast your body loses heat, not just the air temperature. At 0°F with no wind, a properly dressed person can stay outside for extended periods. At 0°F with 30 mph wind (wind chill -26°F), frostbite can occur on exposed skin in under 15 minutes. Understanding wind chill is literally a matter of survival in cold climates.
The NWS Wind Chill Formula Explained
The current wind chill formula was adopted in November 2001 by the US National Weather Service and Environment Canada. It replaced the older Siple-Passel formula from 1945, which was based on how quickly water froze in a plastic container on the roof of a building in Antarctica - not on actual human skin cooling rates.
The modern formula (WC = 35.74 + 0.6215T - 35.75V^0.16 + 0.4275TV^0.16) was developed using human trial data where volunteers walked on a treadmill in a refrigerated wind tunnel while researchers measured facial skin temperature. The formula is calibrated to a face walking into the wind at 3.1 mph. It is valid for air temperatures at or below 50°F and wind speeds above 3 mph.
Frostbite: Signs, Stages, and Prevention
Frostbite occurs when skin and underlying tissues freeze. It progresses through three stages. Frostnip (first stage) causes numbness and redness but no permanent damage - warming the skin reverses it completely. Superficial frostbite (second stage) causes the skin to feel warm despite being cold, and ice crystals form in the tissue. Deep frostbite (third stage) affects all layers including muscle and bone and can result in permanent tissue damage.
The extremities are most vulnerable: fingers, toes, nose, ears, and cheeks have less insulation and reduced blood flow in cold conditions (vasoconstriction). To prevent frostbite, cover all exposed skin when wind chill is below 0°F. Keep extremities dry because wet skin loses heat 25 times faster. Wear mittens instead of gloves because fingers sharing warmth stay warmer than isolated fingers.
Hypothermia: When Your Core Temperature Drops
Hypothermia occurs when body core temperature falls below 95°F (35°C). Mild hypothermia (95-90°F) causes shivering, confusion, and loss of coordination. Moderate hypothermia (90-82°F) causes shivering to stop, severe confusion, and drowsiness. Severe hypothermia (below 82°F) can cause unconsciousness, irregular heartbeat, and death if untreated.
Wind chill dramatically accelerates hypothermia risk. In calm 20°F air, a well-dressed adult can function normally for hours. With 30 mph wind (wind chill -2°F), the same person begins losing core temperature much faster. Wet clothing makes it even worse - a person in wet clothes at 50°F with moderate wind can develop hypothermia. Always carry dry base layers and a wind-blocking outer layer in cold weather.
Wind Chill for Motorcyclists and Cyclists
For motorcyclists, your riding speed creates the wind chill effect. At 60 mph in 40°F air, the wind chill is about 25°F - cold enough to require serious winter gear. At 60 mph in 20°F, wind chill drops to about 3°F, with frostbite risk on any exposed skin. Even at 30 mph in 30°F, wind chill reaches about 20°F.
Cyclists face similar challenges at lower speeds. A 20 mph cycling pace in 35°F weather creates a wind chill of about 24°F. Headwinds add directly to your speed for wind chill calculation - cycling into a 15 mph headwind at 20 mph means 35 mph effective wind speed. Windproof outer layers are essential for cold-weather cycling. Heated grips, hand guards, and balaclavas can make riding possible in conditions that would otherwise be too dangerous.
Wind Chill Calculator FAQ
Common questions about wind chill, frostbite, and cold weather safety.
Disclaimer: This Wind Chill Calculator uses the official NWS/Environment Canada wind chill temperature index formula. Frostbite and hypothermia times are estimates based on average exposure conditions. Individual risk varies based on clothing, physical condition, moisture, and sun exposure. Always err on the side of caution in extreme cold.