National Weather Service

Convert degrees Celsius to degrees Fahrenheit:
Enter degrees celsius:

    

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Convert degrees Fahrenheit to degrees Celsius:
Enter degrees fahrenheit:

    

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Calculate relative humidity from temperature/dewpoint (deg C):
Enter temperature in degrees C:     Enter dewpoint in degrees C:

    

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Calculate relative humidity from temperature/dewpoint (deg F):
Enter temperature in degrees F:     Enter dewpoint in degrees F:

    

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Calculate heat index from temperature and humidity:
Enter temperature in degrees F:     Enter humidity in percent:

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Calculate heat index from temperature and dewpoint (deg F):
Enter temperature in degrees F:     Enter dewpoint in degrees F:

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Calculate heat index from temperature and dewpoint (deg C):
Enter temperature in degrees C:     Enter dewpoint in degrees C:

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Calculate wind chill from temperature (deg F) and wind (mph):
Enter temperature in degrees F:     Enter wind speed in mph:

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Calculate wind chill from temperature (deg C) and wind (kt):
Enter temperature in degrees C:     Enter wind speed in knots:

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Convert pressure from inches to millibars:
Enter pressure in inches: