PORCUPINE 11 N, SOUTH DAKOTA

Period of Record General Climate Summary - Heating Degree Days

Station:(396736) PORCUPINE 11 N
From Year=1963 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	1325	1069	902	567	289	80	14	17	180	524	914	1262	7144
60	1170	928	748	426	175	32	3	4	100	379	764	1107	5836
57	1077	843	657	347	121	16	1	2	66	298	675	1014	5118
55	1015	787	597	297	92	10	0	1	49	250	616	952	4666
50	860	646	453	189	41	2	0	0	20	148	473	797	3630

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