<== Degree-day home page
How degree days are computedThe calculation requires daily measurements of maximum and minimum outside air temperatures ( Tmax and Tmin ) and a 'base temperature' Tbase, nominated by the user as an estimate of the outside air temperature at which no artificial heating (or cooling) is required. In the UK Tbase for heating has commonly been set at 15.5oC, but other base temperatures can be adopted.
The degree-day figure for a given month or week is the accumulated total of daily results over the period in question.
The daily result for heating degree days, Dh, is selected from the following formulae, using the first one that matches:
The daily result for cooling degree days, Dc, is selected from the following formulae, using the first one that matches:
Degree Days Direct frequently-asked questions