YELLOWTAIL DAM, MONTANA

Period of Record General Climate Summary - Heating Degree Days

Station:(249240) YELLOWTAIL DAM
From Year=1948 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	1169	906	806	482	245	71	8	12	141	416	784	1068	6108
60	1014	765	653	344	137	25	2	3	74	282	635	914	4848
57	921	680	563	269	90	11	1	1	48	213	547	821	4166
55	859	625	504	223	66	6	0	1	35	173	490	760	3743
50	708	489	365	127	26	2	0	0	16	95	356	610	2793

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