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Period of Record General Climate Summary - Heating Degree Days

Station:(191386) CHATHAM WSMO
From Year=1972 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	1046	930	850	590	357	108	12	10	86	342	577	877	5785
60	891	789	695	441	210	31	1	0	21	199	427	722	4426
57	798	704	602	351	132	11	0	0	7	128	338	629	3701
55	736	647	541	292	89	5	0	0	3	91	282	567	3252
50	581	506	387	154	19	0	0	0	0	28	156	414	2246

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