SUNNYSIDE, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(458207) SUNNYSIDE
From Year=1894 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	1056	788	621	386	190	59	10	16	116	403	741	1003	5389
60	901	647	466	246	89	15	1	2	44	258	592	848	4108
57	808	563	374	172	48	5	0	0	20	180	502	755	3425
55	746	506	315	129	28	2	0	0	10	134	443	693	3006
50	591	367	178	47	5	0	0	0	2	52	299	539	2080

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