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Period of Record General Climate Summary - Heating Degree Days

Station:(473756) HORICON
From Year=1970 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	1490	1240	994	575	268	63	13	29	175	501	869	1318	7536
60	1335	1099	841	434	156	20	1	5	89	358	719	1163	6221
57	1242	1014	749	354	102	8	0	1	53	279	630	1070	5503
55	1180	958	689	303	73	4	0	0	36	230	571	1008	5052
50	1025	816	541	190	27	0	0	0	10	127	429	853	4019

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