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Period of Record General Climate Summary - Heating Degree Days

Station:(479236) WILLOW RESERVOIR
From Year=1934 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	1687	1443	1259	754	393	139	51	90	292	623	1042	1506	9279
60	1532	1302	1104	607	262	62	12	31	177	473	892	1351	7804
57	1439	1217	1011	520	194	34	4	13	120	387	802	1258	6999
55	1377	1160	949	464	154	21	1	7	89	332	742	1196	6492
50	1222	1019	795	329	76	5	0	1	35	209	594	1041	5326

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