YELLOWTAIL DAM, MONTANA

Period of Record General Climate Summary - Cooling Degree Days

Station:(249240) YELLOWTAIL DAM
From Year=1948 To Year=2006
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	1	2	8	45	156	346	595	568	272	76	6	2	2078
57	0	1	5	31	119	292	534	506	224	54	3	1	1770
60	0	0	2	16	73	216	442	415	160	30	1	0	1357
65	0	0	1	4	25	112	293	269	78	9	0	0	791
70	0	0	0	0	6	46	159	143	30	2	0	0	386

Cooling Degree Day units are computed as the difference between the daily average temperature and the base temperature. (Daily Ave. Temp. - Base Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is above the base temperature. Negative numbers are discarded. Example: If the days high temperature was 95 and the low temperature was 51, the base 60 heating degree day units is ((95 + 51) / 2) - 60 = 13. 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