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Period of Record General Climate Summary - Heating Degree Days

Station:(213411) GULL LAKE DAM
From Year=1911 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	1774	1449	1211	699	325	88	22	46	248	593	1057	1560	9071
60	1619	1307	1056	552	201	31	4	11	140	443	907	1405	7677
57	1526	1223	963	467	141	14	1	4	91	359	817	1312	6916
55	1464	1166	901	411	107	7	0	1	65	306	757	1250	6436
50	1309	1025	747	281	47	1	0	0	23	189	608	1095	5325

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