CIRCLE, MONTANA

Period of Record General Climate Summary - Heating Degree Days

Station:(241758) CIRCLE
From Year=1963 To Year=2006
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1558	1214	1051	622	328	106	22	40	248	594	1038	1426	8247
60	1403	1072	896	476	206	41	5	13	146	445	888	1271	6863
57	1310	988	803	392	146	19	2	5	100	362	798	1178	6103
55	1248	931	742	340	112	10	1	3	75	309	739	1116	5626
50	1093	790	589	222	52	2	0	0	33	195	591	961	4530

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 Jul 28, 2006
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