COLVILLE, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(451630) COLVILLE
From Year=1917 To Year=2005
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1246	986	778	482	278	118	24	42	200	545	900	1148	6746
60	1091	844	623	335	152	39	4	8	95	392	750	993	5324
57	998	760	530	252	93	16	1	2	54	303	660	900	4567
55	936	703	468	200	62	7	0	1	35	246	600	838	4096
50	781	562	315	92	16	0	0	0	9	128	450	683	3036

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