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Period of Record General Climate Summary - Heating Degree Days

Station:(391777) CLEAR LAKE
From Year=1903 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	1651	1363	1105	632	286	70	15	33	205	542	1022	1484	8409
60	1496	1221	950	489	173	24	2	8	112	398	872	1329	7076
57	1403	1137	858	407	120	11	1	2	72	319	782	1236	6348
55	1341	1080	797	355	91	6	0	1	51	270	722	1174	5889
50	1186	939	646	237	40	1	0	0	19	165	576	1019	4827

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