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Period of Record General Climate Summary - Heating Degree Days

Station:(218907) WHEATON
From Year=1914 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	1683	1364	1118	596	258	55	10	24	178	516	996	1499	8297
60	1528	1222	964	454	151	18	1	5	92	375	846	1344	7000
57	1435	1137	871	373	103	8	0	1	57	297	756	1251	6289
55	1373	1081	810	322	77	4	0	0	39	249	697	1189	5841
50	1218	940	658	207	33	0	0	0	13	149	550	1034	4800

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