KETCHIKAN, ALASKA

Period of Record General Climate Summary - Heating Degree Days

Station:(504590) KETCHIKAN
From Year=1949 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	973	804	832	654	497	320	219	207	340	578	759	899	7081
60	818	663	677	505	343	179	90	80	193	423	609	744	5322
57	725	578	584	415	254	105	35	28	113	330	519	651	4336
55	663	522	522	355	197	63	14	10	70	268	459	589	3731
50	508	381	367	211	76	7	0	0	11	127	311	434	2433

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