MC MILLIN RESERVOIR, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(455224) MC MILLIN RESERVOIR
From Year=1941 To Year=2006
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	838	685	660	509	353	208	101	92	202	442	655	808	5553
60	683	544	505	361	211	91	24	18	86	289	505	653	3970
57	590	459	412	274	137	41	6	4	40	203	415	560	3142
55	528	403	351	219	95	20	2	1	20	152	355	498	2644
50	375	264	204	99	24	1	0	0	3	55	214	345	1583

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