Weather Calculators and Unit Conversions

Calculators ➡︎ These meteorological calculators will help you convert units and compute various parameters from observations.

• ● Temperature Units
• ● Wind Chill
• ● Humidity
• ● Heat Index
• ● Wind Speed
• ● Wet-Bulb

Temperature from ºF to ºC or ºC to ºF

Convert Temperature from ºF to ºC or ºC to ºF
Enter a temperature (ºF or ºC), then click the corresponding “convert” button to see the result.
Fahrenheit (oF)
Celsius (oC)

Temperature Conversion
Enter a temperature in Fahrenheit then click “convert” to see the result.
Fahrenheit (oF)
Celsius (oC)
OR in Celsius
Celsius (oC)
Fahrenheit (oF)

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Calculate the windchill Index

Windchill Calculation
Enter in the air temperature (Tair) in degrees Fahrenheit and wind speed in mph, then click on the Calculate WC to compute the windchill
Tair oF		wind (mph)
OR use dew point temperature
Tair oC		wind (mph)

Windchill Calculation (Fahrenheit and Celsius)
Enter in the air temperature (Tair) in degrees Fahrenheit and wind speed in mph, then click on the Calculate WC to compute the windchill
Temperature	ºF
Wind (mph)	mph
Windchill =	ºF
OR in Celsius
Temperature	ºC
Wind (mph)	mph
Windchill =	ºC

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Relative Humidity Calculator

Relative Humidity Calculator (from Dew Point)
Enter in the air temperature (Tair) and dew point temperature (Tdp) in degrees Fahrenheit (oF) or Celcius (oC, second row), then click "Calc RH" to compute the relative humidity (RH).
Tair oF		Tdp oF
Tair oC		Tdp oC

Relative Humidity Calculator
Enter in the air temperature (Tair) and dew point temperature (Tdp) in degrees Fahrenheit (oF).
Fahrenheit (oF)
Tdp oF
Relative Humidity
OR in Celsius
Celsius (oC)
Tdp oC
Relative Humidity

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Heat Index Calculator

Heat Index Calculation
Enter in the air temperature (Tair) in degrees Fahrenheit and relative humidity (RH) in percent (without the % sign), then click on the Calculate HI to compute the heat index (HI) | Use the heat index tables
Tair		RH			HI=
OR use dew point temperature
Tair		Tdp			HI=

Heat Index Calculation
Enter in the air temperature (Tair) in degrees Fahrenheit and relative humidity (RH) in percent (without the % sign), then click on the Calculate HI to compute the heat index (HI) | Use the heat index tables
Temperature	ºF
Relative Humidity	%
Heat Index =
OR use dew point temperature
Temperature	ºF
Dew Point Temp	ºF
Heat Index =

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Convert Wind Speed Units

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

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Wet-Bulb Calculator

Wet-Bulb Temperature from Dewpoint
Temp:	Dewpoint:			Pressure*:
Fahrenheit Celsius Kelvin	Fahrenheit Celsius Kelvin			in. of mercury mm of mercury mb (hPA)
				*not altimeter setting
Conversion/Answers
Wet-bulb temperature: ºF  ºC  K			Rel Humidity: %