LAKE KEECHELUS, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(454414) LAKE KEECHELUS
From Year=1931 To Year=1977
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1192	1009	996	779	573	351	186	186	335	622	902	1089	8219
60	1037	868	841	629	422	217	86	85	202	467	752	934	6541
57	944	783	748	540	334	149	47	46	136	376	662	841	5605
55	882	727	686	480	277	109	29	27	99	317	602	779	5014
50	727	585	531	334	153	37	5	4	35	181	452	624	3669

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