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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):  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