HEATING DEGREE DAY
One heating degree day is given for each degree that the daily mean temperature is below 65 degrees Fahrenheit. It is used as an indication of fuel consumption. Refer to degree day or cooling degree day.
useful in determining heating energy requirements. Defined as (65 - MT)= HDD,where MT is Mean Temperature (F). If MT is greater than 65 degrees F, HDD=0. MT= Mean (average)Temperature of the day. MT=(High Temperature+Low Temperature)/2
