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Weather Calculators

Temperature Conversion

Enter a number then click on the the conversion button.
Fahrenheit (o F)

Celsius  (o C)

Wind Speed Calculations
Enter a speed into any blank to convert to all other wind speeds.
 mph   knots      m/sec    km/hr     

Wind Chill Calculation

Enter the temperature in degrees Fahrenheit and wind speed in mph, then click on the Calculate WC to compute the windchill index.
Temp
(o F)

Wind
(mph)

Wind Chill Index

Relative Humidity Calculation

Enter the air temperature and the dew point in degrees Fahrenheit, then click on the Calculate RH to compute the relative humidity.
Temp
(o F)

Dew
Point

Dew Point from Relative Humidity
Enter a temperature and relative humidity.
Temperature: Fahrenheit Celsius
RH:   %
   Dewpoint
oF oC
Wet-bulb from Relative Humidity
Enter a temperature, relative humidity and actual station pressure.
Temperature:   Fahrenheit Celsius RH:  %
Enter your actual station pressure (not the altimeter setting):
in of mercury mm of merc. millibars (hPA)
Wet-bulb
   oF oC
Heat Index Calculations
Enter the temperature in degrees Fahrenheit and the Dew Point (Tdp), or relative humidity (RH) in percent (without the % sign).  Then click on the Calculate HI to compute the heat index (HI).
Temp (o F)

Tdp

HI RH

OR
Temp (o F)

RH

HI

Tdp

Click for Heat Index Danger Ranges

Station Pressure Calculation

What is the current altimeter (inches)?
What is the station elevation? (feet)
i.e. Urbana = 743
The Station Pressure in inches is:
The Station Pressure in millibars is:
The Pressure Altitude in feet is:

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