COLVILLE AP, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(451650) COLVILLE AIRPORT
From Year=1937 To Year=1987
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1259	961	832	549	321	139	38	48	221	579	934	1177	7057
60	1104	819	677	400	187	54	8	10	114	424	784	1022	5605
57	1011	735	584	313	123	25	3	3	69	334	694	929	4822
55	949	678	522	256	87	13	1	1	47	277	634	867	4332
50	794	537	368	133	27	1	0	0	12	151	485	712	3219

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