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Period of Record General Climate Summary - Heating Degree Days

Station:(216276) OTTERTAIL
From Year=1940 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	1776	1437	1178	656	281	66	14	32	220	563	1061	1577	8861
60	1621	1295	1023	510	167	21	2	7	121	416	911	1422	7516
57	1528	1211	930	426	115	9	0	2	76	333	822	1329	6780
55	1466	1154	869	372	87	4	0	1	53	281	762	1267	6315
50	1311	1013	715	247	37	0	0	0	18	169	614	1112	5236

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