WILLAPA HARBOR, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(459291) WILLAPA HARBOR
From Year=1895 To Year=1979
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	765	622	626	483	358	228	128	111	180	360	567	707	5135
60	610	481	471	336	213	101	29	21	67	212	417	552	3509
57	517	397	379	250	136	44	6	3	26	135	327	459	2679
55	455	340	319	196	91	21	1	1	11	92	269	397	2192
50	302	204	175	80	19	1	0	0	1	25	135	246	1188

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