SPIRIT LAKE RS, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457919) SPIRIT LAKE RANGER STN
From Year=1932 To Year=1956
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1133	991	1021	814	688	503	233	233	371	640	867	1002	8496
60	978	850	866	665	534	360	116	112	231	485	717	847	6760
57	885	765	773	576	443	279	65	60	156	393	627	754	5777
55	823	708	711	516	383	228	42	36	114	333	567	692	5154
50	668	567	556	369	237	115	11	6	42	195	417	537	3719

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