GANN VALLEY 4 NW, SOUTH DAKOTA

Period of Record General Climate Summary - Heating Degree Days

Station:(393217) GANN VALLEY 4 NW
From Year=1897 To Year=2009
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1532	1253	1007	560	253	58	7	14	150	472	950	1381	7638
60	1377	1112	853	419	148	20	1	3	78	334	800	1226	6371
57	1284	1027	761	341	99	9	0	1	49	260	710	1133	5675
55	1222	971	700	293	73	5	0	0	34	216	651	1071	5237
50	1067	830	553	186	31	1	0	0	12	127	505	916	4226

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