CHELAN, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(451350) CHELAN
From Year=1890 To Year=2012
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1153	886	719	439	209	59	11	10	109	442	809	1102	5948
60	998	745	564	292	99	14	1	1	38	292	659	947	4650
57	905	660	471	209	53	5	0	0	17	209	569	854	3951
55	843	604	409	158	31	2	0	0	8	158	509	792	3514
50	688	462	257	60	5	0	0	0	1	61	361	637	2532

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