DUTCH HARBOR, ALASKA

Period of Record General Climate Summary - Heating Degree Days

Station:(502587) DUTCH HARBOR
From Year=1951 To Year=2006
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1006	927	966	863	727	548	417	358	493	707	831	945	8789
60	851	786	811	713	572	398	263	209	343	552	681	790	6969
57	758	701	718	623	479	308	173	127	254	459	591	697	5888
55	696	645	656	563	417	249	117	80	196	397	531	635	5180
50	541	504	501	413	262	106	17	8	71	242	381	480	3526

Heating Degree Day units are computed as the difference between the base temperature and the daily average temperature. (Base Temp. - Daily Ave. Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is below the base temperature. Negative numbers are discarded. Example: If the days high temperature was 65 and the low temperature was 31, the base 50 heating degree day units is 50 - ((65 + 31) / 2) = 2. This is done for each day of the month and summed.
Table updated on Jul 28, 2006
Months with 5 or more missing days are not considered
Years with 1 or more missing months are not considered

Western Regional Climate Center, wrcc@dri.edu