COLFAX, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(451586) COLFAX 1 NW
From Year=1892 To Year=1994
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1103	870	764	530	342	170	54	64	235	510	803	1018	6462
60	948	729	609	382	207	73	13	17	122	359	653	863	4976
57	855	645	516	298	139	36	4	6	74	273	563	770	4178
55	793	588	454	244	101	20	1	3	50	220	503	708	3685
50	638	447	305	128	35	3	0	0	14	109	356	553	2588

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