Mr. Ron Murphy of the National Weather Service devised most of the following calculators.  He asked no credit, but allowed free use of his work, so I think he deserves recognition for the service his work does us.  Thanks, Ron!  The dew point calculation uses formula coefficients that originated at the Nebraska Earth Science Education Network.

WINDCHILL (WC) CALCULATION [old formula; see new formula]
Input dry air temperature (Tdryo F) and wind speed (mph).  Shows windchill (o F).
Tdryo F		mph			WC =

DEW POINT TEMPERATURE (Tdp) CALCULATION

Input dry bulb temperature (Tdryo F) and wet bulb temperature (Tweto F).  Click Calculate for Tdp o F.

TdryoF

TwetoF

TdpoF =

 

RELATIVE HUMIDITY (RH) CALCULATION
Input dry air temperature (Tdryo F) and dew point (Tdpo F).  Click Calculate for RH (%).
TdryoF		Tdp			RH =

 

RELATIVE HUMIDITY (RH) CONVERSION
Input dry air temperature (Tdryo F) and humidity (RH %).  Calculates HI (o F)  and Tdpo F.
TdryoF		RH			HI =	Tdp=

HEAT INDEX (HI) AND RELATIVE HUMIDITY (RH) CALCULATION
Input dry air temperature (Tdryo F) and dew point temperature (Tdpo F).  Calculates HI (o F) and RH (%).
TdryoF		TdpoF			HI =	RH=

Here's a couple of external links to useful Geodetic converters:

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            N. C. Heywood maintains this page, last updated 15SEP03.