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Instead of the long and complex equations (which can be found with your favorite search engine), here are a couple of calculators. They use the latest equations from the National Weather Service, so they may vary a little from older online calculators and tables.

Heat Index

Note: This Heat Index is on based shade temperatures and a wind speed of about 6 MPH. Standing in direct sunlight with no breeze can increase the Heat Index by 15 F or more!

Enter temp & choose units: What it feels like:
Fahrenheit Celsius F
Enter humidity:
% C

Wind Chill

Note: Wind speeds below 5 MPH and above 50 MPH have very litte effect on wind chill. Bright sunshine can reduce the effect of wind chill by several degrees. Frostbite occurs to exposed skin in 15 minutes or less with a wind chill of -18 F (-28 C) or below.

Enter temp & choose units: What it feels like:
Fahrenheit Celsius F
Enter wind speed:
mph knots m/s k/h C


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