ATTU N A U, ALASKA

Period of Record General Climate Summary - Heating Degree Days

Station:(500452) ATTU N A U
From Year=1949 To Year=1993
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1074	986	1039	907	809	634	518	450	517	709	886	1027	9556
60	919	844	884	757	654	484	363	295	367	554	736	872	7730
57	826	759	791	668	561	394	270	204	278	461	646	779	6637
55	764	703	729	608	499	334	209	146	219	399	586	717	5912
50	609	561	574	458	344	186	74	34	85	245	436	562	4167

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