CHINOOK, MONTANA

Period of Record General Climate Summary - Cooling Degree Days

Station:(241722) CHINOOK
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	0	0	0	14	99	253	442	394	125	17	1	0	1344
57	0	0	0	8	70	201	381	335	91	10	0	0	1096
60	0	0	0	3	38	134	290	250	53	4	0	0	773
65	0	0	0	0	10	55	155	129	16	0	0	0	366
70	0	0	0	0	2	15	60	46	3	0	0	0	127

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