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Period of Record General Climate Summary - Heating Degree Days

Station:(476718) PORTAGE
From Year=1889 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	1464	1232	997	543	235	53	9	24	155	450	856	1303	7321
60	1309	1091	843	404	133	17	1	4	76	313	706	1148	6046
57	1216	1006	752	326	86	7	0	1	45	240	617	1055	5351
55	1154	950	691	277	62	3	0	0	30	196	559	993	4915
50	999	809	543	169	22	0	0	0	9	107	417	838	3914

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