BIG SKY 2 WNW, MONTANA

Period of Record General Climate Summary - Heating Degree Days

Station:(240775) BIG SKY 3 S
From Year=1984 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	1424	1231	1106	848	626	385	179	215	435	786	1166	1472	9873
60	1269	1090	951	698	471	241	67	88	288	631	1016	1317	8127
57	1176	1005	858	608	379	167	31	42	209	539	926	1224	7163
55	1114	949	796	548	320	125	17	25	161	477	866	1162	6561
50	959	808	641	399	191	52	3	6	71	330	716	1007	5183

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