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WeatherWind Chill Calculator
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Often cold temperatures can feel much colder based on the speed of the wind. That effect is called the wind
chill factor. To calculate wind chill, enter the current ambient temperature in degrees Fahrenheit (°F)
and enter the speed of the wind in miles per hour; if you don't know those values in °F or MPH (statute
miles per hour), enter them in °C and knots (often called nautical miles per hour), or KmPH (kilometers
per hour) in the appropriate fields. Keep in mind that wind speeds of under 5 MPH have a negligible effect
on the wind chill calculation. You may make either temperature designation entry with any speed designation
entry if you wish. Click on the calculate button for the wind chill corrected temperature effect, displayed
in degrees Fahrenheit and Celsius. There are two formula for calculating the wind chill effect; one called
the old formula and one called the (obviously) new formula. We calculate and display both and as you will see,
the new formula has a more intense and chilling result. Our default values of 32 degrees Fahrenheit and 1 MPH
(nautical) do NOT demonstrate the severe effect of how the air feels based on the wind chill factor. Change
the speed value (in any designation) and watch the effect. You can also see our
wind chill table if you prefer (below the calculator). Please also look at our
temperature conversion programs.
There is no effect on either the old or new formula if wind speeds are under 3 MPH statute, while there is no effect on the old system until the are near 5 MPH statute, or the equivalent in other speed designations. The greatest range of wind speeds for effect is from 5 to 50 MPH statute. While the change in the wind chill factor above 50 MPH statute is not really negligible, it is minimal. That wind effect tends to evaporate the moisture from the air and cause the enhanced cooling effect to humans, plants and animals, just as a breeze does on a hot summer day. Great care should be taken to avoid conditions conducive to low temperatures, with or without wind chill factors. However, with a wind chill effect, the possibility of frostbite is greatly increased. |
| Wind Chill Calculator |
Wind speeds of less than 5 MPH (Statute) have virtually no wind chill
factor on the old formula and less than 3 MPH (Statute) have little
or no effect on the new formula!
factor on the old formula and less than 3 MPH (Statute) have little
or no effect on the new formula!
| Wind Chill Table |
Often cold temperatures can feel much colder based on the speed of the wind. That effect is called the wind chill
factor. This table has factors of wind speed in miles per hour (MPH) in the vertical columns, getting progressively
faster from top to bottom of the chart, and temperature in degrees Fahrenheit in the rows, getting progressively
colder from left to right. Keep in mind that wind speeds of under 5 MPH have a negligible effect on the wind chill
calculation. You can also use our wind chill calculator (above) if you wish to see a wind speed or
temperature not shown here.
The greatest range of wind speeds for effect is from 5 to 50 MPH. While the change in the wind chill factor above 50 MPH is not really negligible, it is minimal. That wind effect tends to evaporate the moisture from the air and cause the enhanced cooling effect to humans, plants and animals, just as a breeze does on a hot summer day. Great care should be taken to avoid conditions conducive to low temperatures, with or without wind chill factors. However, with a wind chill effect, the possibility of frostbite is greatly increased.
The greatest range of wind speeds for effect is from 5 to 50 MPH. While the change in the wind chill factor above 50 MPH is not really negligible, it is minimal. That wind effect tends to evaporate the moisture from the air and cause the enhanced cooling effect to humans, plants and animals, just as a breeze does on a hot summer day. Great care should be taken to avoid conditions conducive to low temperatures, with or without wind chill factors. However, with a wind chill effect, the possibility of frostbite is greatly increased.
| Wind Speed MPH |
Air Temperature, degrees Fahrenheit | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 35 | 30 | 25 | 20 | 15 | 10 | 5 | 0 | -5 | -10 | -15 | -20 | -25 | -30 | -35 | -40 | -45 | |
| 5 | 33 | 27 | 21 | 16 | 12 | 7 | 1 | -6 | -11 | -15 | -20 | -26 | -31 | -35 | -41 | -47 | -54 |
| 10 | 21 | 16 | 9 | 2 | -2 | -9 | -15 | -22 | -27 | -31 | -38 | -45 | -52 | -58 | -64 | -70 | -77 |
| 15 | 16 | 11 | 1 | -6 | -11 | -18 | -25 | -33 | -40 | -45 | -51 | -60 | -65 | -70 | -78 | -85 | -90 |
| 20 | 12 | 3 | -4 | -9 | -17 | -24 | -32 | -40 | -46 | -52 | -60 | -68 | -76 | -81 | -88 | -96 | -103 |
| 25 | 7 | 0 | -7 | -15 | -22 | -29 | -37 | -45 | -52 | -58 | -67 | -75 | -83 | -89 | -96 | -104 | -112 |
| 30 | 5 | -2 | -11 | -18 | -26 | -33 | -41 | -49 | -56 | -63 | -70 | -78 | -87 | -94 | -101 | -109 | -117 |
| 35 | 3 | -4 | -13 | -20 | -27 | -35 | -43 | -52 | -60 | -67 | -72 | -83 | -90 | -98 | -105 | -113 | -123 |
| 40 | 1 | -4 | -15 | -22 | -29 | -36 | -45 | -54 | -62 | -69 | -76 | -87 | -94 | -101 | -107 | -116 | -128 |
| Little Danger Increasing Danger Great Danger | |||||||||||||||||
| Imperial/American Wind Chill Chart Metric Wind Chill Chart | |||||||||||||||||
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