KETCHIKAN INTL AP, ALASKA

Period of Record General Climate Summary - Heating Degree Days

Station:(504590) KETCHIKAN
From Year=1949 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	969	808	837	660	499	321	220	209	342	580	765	905	7116
60	814	667	682	510	345	181	90	81	195	425	615	750	5355
57	721	582	589	420	256	105	35	29	114	332	526	657	4367
55	659	525	527	361	199	64	14	10	70	271	466	595	3760
50	504	384	372	215	78	7	0	1	11	129	317	440	2459

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