YELLOWTAIL DAM, MONTANA

Period of Record General Climate Summary - Heating Degree Days

Station:(249240) YELLOWTAIL DAM
From Year=1948 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	1163	917	801	490	255	73	7	12	144	421	783	1080	6146
60	1008	776	648	352	146	26	2	3	75	286	634	926	4882
57	916	692	558	276	97	12	1	1	49	216	546	833	4195
55	854	636	499	229	71	7	0	1	36	176	489	772	3769
50	702	500	360	131	28	2	0	0	15	96	355	621	2811

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