↑↓ to move ↵ to open Esc to close Browse all tools

Wind Chill Calculator

See how cold it feels when the wind blows. Enter the air temperature and the wind speed to get the NWS wind chill temperature and the frostbite time from the NWS wind chill chart.

Weather

°F At or below 50 °F. Use a minus sign for cold below zero.
mph As given in your local weather report.
Wind chill, feels like
−19 °F
Frostbite in 30 minutes

Air temperature
-
Wind speed
-
Colder by
-
Nearest chart cell
-

NWS wind chill chart (°F, mph)

Air temperature across, wind speed down. The shading shows the frostbite times of the NWS chart. The cell nearest to your values is outlined.

mph \ °F4035302520151050−5−10−15−20−25−30−35−40−45
5363125191371−5−11−16−22−28−34−40−46−52−57−63
103427211593−4−10−16−22−28−35−41−47−53−59−66−72
153225191360−7−13−19−26−32−39−45−51−58−64−71−77
20302417114−2−9−15−22−29−35−42−48−55−61−68−74−81
2529231693−4−11−17−24−31−37−44−51−58−64−71−78−84
3028221581−5−12−19−26−33−39−46−53−60−67−73−80−87
3528211470−7−14−21−27−34−41−48−55−62−69−76−82−89
402720136−1−8−15−22−29−36−43−50−57−64−71−78−84−91
452619125−2−9−16−23−30−37−44−51−58−65−72−79−86−93
502619124−3−10−17−24−31−38−45−52−60−67−74−81−88−95
552518114−3−11−18−25−32−39−46−54−61−68−75−82−89−97
602517103−4−11−19−26−33−40−48−55−62−69−76−84−91−98
  • Frostbite in 30 minutes
  • 10 minutes
  • 5 minutes

For information only. In cold weather, follow the advice of your local weather service. Runs on your device, nothing you enter is sent to a server.

Ad space Your ad here Reach people who use free tools every day. See slots and prices

Wind Chill Calculator by Freebiefy, free online tools

Embed this tool on your site

Paste this code into your page. The tool runs in the visitor's browser, free and without signup. The height adjusts to the content. All tools you can embed

Ad space Your ad here Reach people who use free tools every day. See slots and prices

What wind chill means

The wind chill temperature is how cold people and animals feel outside. It is based on how fast exposed skin loses heat to wind and cold: the stronger the wind, the faster it draws heat from the body, so it feels colder than the thermometer reads. The NWS gives this example: at 0 °F with a 15 mph wind, the wind chill is −19 °F, and exposed skin can freeze in 30 minutes (NWS, Understanding Wind Chill).

The wind chill formula

The NWS chart, effective November 1, 2001, gives the formula. It takes the air temperature in °F and the wind speed in mph, as printed on the NWS wind chill chart:

Wind chill (°F)
35.74 + 0.6215·T − 35.75·V^0.16 + 0.4275·T·V^0.16

For °C and km/h, the calculator converts the temperature to °F and the wind speed to mph (1 mph = 1.609344 km/h) first, as the NWS calculator notes describe, and converts the result back to °C. The wind chill is defined only at or below 50 °F (10 °C) and for winds above 3 mph (4.8 km/h).

Frostbite times

The NWS chart shades three frostbite zones: 30 minutes, 10 minutes and 5 minutes. They are drawn as curved bands across the grid, so the calculator shows the zone of the chart cell nearest to your values and names that cell, so you can find it on the chart. Outside the chart (below −45 °F or above 60 mph), it shows no frostbite time.

  • Frostbite needs freezing air. The NWS says you can only get frostbite if the actual air temperature near your skin, not the wind chill, is below freezing. At 32 °F or above, the calculator shows no frostbite time.
  • Sun warms. Bright sunshine may raise the wind chill temperature by 10 to 18 °F, according to the NWS.
  • Children were not tested. The NWS tests were done on adults. The NWS advises to use the chart as a starting point and be even more cautious with children, the elderly and people with compromised health.

How to use the wind chill calculator

  1. 1Pick °F and mph or °C and km/h. If your forecast gives the wind in another unit, the speed converter turns knots or m/s into mph or km/h.
  2. 2Enter the air temperature and the wind speed.
  3. 3Read the wind chill and the frostbite time of the nearest chart cell. Copy the result or a link. For hot, humid days, use the heat index calculator.

Built by Tobias Kurth, designer. Updated .

Frequently asked questions

How is wind chill calculated?

The National Weather Service (NWS) uses Wind chill (°F) = 35.74 + 0.6215T − 35.75(V^0.16) + 0.4275T(V^0.16), with the air temperature T in °F and the wind speed V in mph. For °C and km/h, the calculator converts to °F and mph first and converts the result back.

When is wind chill defined?

The NWS defines the wind chill temperature only for air temperatures at or below 50 °F (10 °C) and wind speeds above 3 mph (about 4.8 km/h). Outside that range, the calculator shows no wind chill.

Can I get frostbite when it is above freezing?

No. The NWS says the air temperature has to be below freezing for frostbite to develop on exposed skin, so a wind chill below freezing at an air temperature above freezing does not cause frostbite. You can still get hypothermia from exposure to cold.

Does wind chill cool my car or my water pipes below the air temperature?

No. According to the NWS, wind chill applies only to people and animals. Wind makes objects like car radiators and water pipes cool down to the air temperature faster, but not below it.

Does humidity change the wind chill?

Hardly. When the NWS tested the current index on 12 test subjects, relative humidity changed the outcome by less than 1 degree, so it was left out of the formula.

Is my data sent anywhere?

No. The calculation runs in your browser, nothing is stored or sent.

Ad space Your ad here Reach people who use free tools every day. See slots and prices