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The Weather Calculator by Tim Brice and Todd Hall at NOAA
Weather Term Definitions

Temperature Conversions: 
Temperature Unit Conversion Formulas
Heat Index Formula
Wind Chill  Formulas
Cricket Chirps   (Just for fun) Formula
 
Moisture Conversions 
Dewpoint and Wet-bulb from Relative Humidity Formulas
Relative Humidity and Wet-bulb from Dewpoint Formulas
Relative Humidity and Dewpoint from Wet-bulb Formulas
Vapor Pressure Formulas
Mixing Ratio Formulas
Virtual Temperature Formulas
 
Pressure Conversions 
Pressure Unit Conversion Formulas
Station Pressure Formulas
Altimeter Setting Formulas
Pressure Altitude Formulas
Density Altitude Formulas
 
Wind Conversions
Wind Speed Unit Conversion Formulas
 
Misc
Speed of Sound Formulas
Weather Term Calculator (Just for fun)  
Showalter Index Formulas