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San Diego, CA

Weather Forecast Office

calculator

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Weather Calculator

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)

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

Heat Index Calculations
Enter the temperature in degrees Fahrenheit and relative humidity (RH) in percent (without the % sign), or the Dew Point (Tdp).  Then click on the Calculate HI to compute the heat index (HI).
Temp
(o F)

RH

HI

Tdp

OR
Temp
(o F)

Tdp

HI RH

Station Pressure Calculation
What is the current altimeter (inches)?
What is the station elevation? (feet)
i.e. St. Louis - Lambert= 710
     
The Station Pressure in inches is:
The Station Pressure in millibars is:
The Pressure Altitude is (feet):

Altimeter Setting Calculation
What is the current station pressure (inches)?
What is the station elevation? (feet)
i.e. St. Louis - Lambert= 710
     
The current altimeter in inches is:
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