ST IGNATIUS, MONTANA

Period of Record General Climate Summary - Heating Degree Days

Station:(247286) ST IGNATIUS
From Year=1896 To Year=2010
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1230	1001	870	576	362	172	45	60	267	592	911	1156	7241
60	1075	860	715	427	224	75	11	16	148	439	761	1001	5750
57	982	775	622	340	153	38	3	5	93	349	671	908	4940
55	920	719	560	285	113	21	1	2	66	293	611	846	4437
50	765	578	408	160	43	4	0	0	22	169	463	691	3302

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