DUTCH HARBOR, ALASKA

Period of Record General Climate Summary - Heating Degree Days

Station:(502587) DUTCH HARBOR
From Year=1951 To Year=2012
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1011	915	982	864	732	549	423	363	491	703	830	943	8805
60	856	774	827	714	577	399	269	213	341	548	680	788	6984
57	763	689	734	624	484	309	179	130	252	455	590	695	5903
55	701	633	672	564	422	249	122	82	193	393	530	633	5194
50	546	492	517	414	267	106	20	8	69	239	380	478	3535

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 Oct 31, 2012
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