Hand Calculating Degree Days

This quick answer describes a method to determine degree days using simple hand calculations and a table.  The single sine wave method is used. 

Degree Days Using the Single Sine Method

This quick answer describes a computer program  to determine degree days using the single sine wave method. 

Degree Days Application Program (11 Apr 2005)

This quick answer describes the DEGDAY.XLS Excel application program for calculating degree days using the single sine wave method and the single triangle method.  The application program can be downloaded from the quick answer.

Soil Heat Flow and Temperature

This quick answer describes how to measure and interpret soil heat flux density measurements for use in energy balance calculations.

Radiation

This quick answer describes radiation theory and how to estimate net radiation for use in energy balance calculations.

Sunshine Hours      

This quick answer provides an Excel program to convert from solar irradiance to hours of bright sunshine.

Sensible Heat Flux

This quick answer describes the concepts of sensible heat flux density, which is used in energy balance calculations.

Psychrometer Relationships 

This quick answer describes psychrometric relationships and concepts related to shielding and ventilation of thermometers and psychrometers.

Vapor Pressure Deficit 

This quick answer describes a method and provides tables and equations for measuring vapor pressure deficit in the field.

Humidity Conversions (27 Mar 2005)

This WEB page provides many of the equations needed to convert from one measure of humidity to another.

Dew point Temperature to Other Humidity Variables (27 Mar 2005)

This WEB page has an Excel program for converting from air and dew point temperature to various expressions of humidity.

Wet-Bulb Temperature to Other Humidity Variables (27 Mar 2005)

This WEB page has an Excel program for converting from air and wet-bulb temperature to various expressions of humidity.

CalHum - Humidity Conversion Excel Spreadsheet (27 Mar 2005)

              Lectures