CHINOOK, MONTANA

Period of Record General Climate Summary - Heating Degree Days

Station:(241722) CHINOOK
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 1590 1247 1066 623 316 113 24 48 268 602 1049 1420 8365
60 1435 1106 911 476 189 42 4 14 155 451 899 1265 6946
57 1342 1021 819 390 127 19 1 5 104 363 809 1172 6173
55 1280 965 757 336 94 10 1 2 78 309 749 1110 5690
50 1126 824 604 212 39 2 0 0 34 191 601 955 4588
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