The degree-day is a unit of temperature measure over extended periods of time. The equation used to find degree-days is:

DD = (to-ta) (1 day)

where to is the base temperature (usu. constant at 65), and ta is daily mean temperature. 65 is used for the base temperature because it is considered to be the

The number of degree-days for any amount of time for greater than one day is the algebraic sum of of all products for as many days as the period covers.

Read more about degree-days, and see a more complicated equation.

Original work on this document was done by Central Virginia Governor's School student Patrick Burke (Class of '99).

Copyright © 1998 Central Virginia Governor's School for Science and Technology Lynchburg, VA