NWS Meteorological Calculator

National Weather Service Weather Forecast Office

Thanks to Ron Murphy, NWS Binghamton, NY for writing the JavaScript

Wind Chill can also be determined using this handy chart.
Heat Index can also be determined using this handy chart.

Temperature Conversion
Enter a number then click on the appropriate number to see the result.
Fahrenheit (^oF)
Celsius (^oC)

Relative Humidity Calculation
Enter in the air temperature (T_air) and dew point temperature (T_dp) in degrees Fahrenheit (^oF) then click on the Calculate RH to compute the relative humidity (RH).
T_air		T_dp

Heat Index Calculation
Enter in the air temperature (T_air) in degrees Fahrenheit and relative humidity (RH) in percent (without the % sign), then click on the Calculate HI to compute the heat index (HI).
T_air	RH	T_dp=
OR
T_air	T_dp	RH=
More information about the Heat Index, and also about excessive heat.

Wind Speed Conversion
Input value here and then select units below	ANSWERS:
mph	mph
knots	knots
m/s	m/s
ft/s	ft/s
km/h	km/h

Station Pressure	on next page -- >

Need more? Try the calculator at NWS El Paso

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Windchill Calculation

Enter in the air temperature (T_air) in degrees Fahrenheit and wind speed in mph, then click on the Calculate WC to compute the windchill (WC).

wind
(mph)

More information about the wind chill.