WINTHROP 1 WSW, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(459376) WINTHROP 1 WSW
From Year=1931 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	1392	1083	881	543	316	135	36	46	207	566	969	1325	7499
60	1237	942	726	394	180	49	7	10	101	413	819	1170	6049
57	1144	857	633	307	115	21	2	3	58	324	729	1077	5270
55	1082	800	571	252	80	10	1	1	37	268	669	1015	4786
50	927	659	417	130	25	1	0	0	8	145	519	860	3691

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