WILLAPA HARBOR, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(459291) WILLAPA HARBOR
From Year=1948 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	780	612	633	497	344	212	120	103	162	374	579	712	5130
60	625	471	478	348	200	88	24	16	53	224	429	557	3516
57	532	387	385	260	124	37	4	2	18	145	339	464	2699
55	470	330	324	205	81	16	1	0	8	100	280	402	2217
50	316	194	177	82	15	1	0	0	1	27	145	250	1208

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