COLVILLE BASIC, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(451630) COLVILLE
From Year=1899 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	1256	993	785	496	290	128	32	51	212	552	894	1153	6843
60	1101	852	630	349	160	45	7	12	104	399	744	998	5403
57	1008	767	537	265	99	20	2	4	60	310	654	905	4633
55	946	711	475	213	67	10	1	2	39	254	595	843	4155
50	791	569	322	101	17	1	0	0	10	133	446	688	3078

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