Department of Administrative Services
Capitol Complex "Eye on Energy"
Learn More: Degree Days
A heating degree day (HDD) or cooling degree day (CDD) is an index used to determine the amount of energy needed to heat or cool a building. The number of heating or cooling degrees in a day is defined as the difference between a base temperature – 65° Fahrenheit – and the outside temperature. If, for example, the temperature outside is 55° F, then we would say it is a ten-degree day. Organizations, such as the State of Iowa, use this information to estimate seasonal heating and cooling demands.
Jan |
Feb |
Mar |
Apr |
May |
June |
July |
Aug |
Sept |
Oct |
Nov |
Dec |
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|
HDD |
1469 |
1151 |
904 |
501 |
222 |
44 |
10 |
31 |
136 |
462 |
881 |
1320 |
CDD |
0 |
0 |
1 |
3 |
66 |
180 |
275 |
218 |
67 |
10 |
0 |
0 |