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Weather Related Conversions

 

Credit for this page goes wholly to the authors (listed at the bottom of the page) and to NOAA

Temperature Conversion
Enter a number then click on the appropriate number to see the result.

Fahrenheit (oF)

Celsius (oC)

Wind Chill/Temperature Index Calculation
Enter in the air temperature ( Tair ) in degrees Fahrenheit and wind speed in mile per hour ( mph ), then click on the Calculate WC to compute the windchill ( WC ).

Tairo F

mph

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

Tair ( o F )

Tdp ( o F )

RH
Tair
Tdp

Relative Humidity Calculation using degrees Celsius
Enter in the air temperature ( Tair ) and dew point temperature ( Tdp) in degrees Celsius ( oF ) then click on the Calculate RH to compute the relative humidity ( RH ).

Tair ( o C )

Tdp ( o C )

RH
Tair
Tdp

Heat Index Calculation using degrees Fahrenheit (temp/dewpoint)
Enter in the air temperature ( Tair ) the dew point temperature ( Tdp ) in degrees Fahrenheit, then click on the Calculate HI to compute the heat index ( HI).

Tair in °F

Tdp in °F

RH =

Heat Index Calculation using degrees Fahrenheit (temp/RH)
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 ).

Tair in °F

 

RH

Tdp =

Fire Weather Conversions

Feet to Meters

Feet: 

Meters: 

MPH to MPS

MPH: 

MPS: 

Wind Speed Conversions

Answers:
mph mph
knots knots
m/s m/s
ft/s ft/s
km/h km/h

Calculate Relative Humidity by using:
Temperature, Wet Bulb and Station Pressure

Enter a temperature, wet-bulb and actual station pressure
 
Temperature:  dewpoint
Fahrenheit Celsius Kelvin Fahrenheit
Wet-bulb: Celsius
Fahrenheit Celsius Kelvin Kelvin
Enter your actual station pressure (not the altimeter setting): If station pressure is unknown, use 29.76 inches of mercury. This is the average station pressure for Shreveport and should work well except in mountainous regions. Even big changes in pressure (1.00 in. of mercury) will usually only change the RH by less than 1%. Give it a try!  relative humidity
in of mercury mm of mercury millibars (hPA) %



Original concepts by Ron Murphy, WFO BGM & Todd Hall, Tim Brice, WFO ELP & Jason Elliott, WFO MEG  

Script is by Ron Murphy. Updated 8/18/1999. Coding edited by Jason Elliott for additional elements. Updated 6/14/2002

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