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Period of Record General Climate Summary - Heating Degree Days

Station:(214103) ISLE 12 N
From Year=1959 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	1787	1455	1217	720	363	117	38	68	268	617	1075	1593	9317
60	1632	1314	1062	572	234	47	9	21	159	468	925	1438	7880
57	1539	1229	970	486	168	23	3	8	107	383	835	1345	7096
55	1477	1173	908	430	131	14	1	4	79	329	775	1283	6603
50	1322	1031	754	298	62	3	0	0	30	207	627	1128	5462

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