ST MARY, MONTANA

Period of Record General Climate Summary - Heating Degree Days

Station:(247292) ST MARY
From Year=1981 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 1301 1087 1022 753 523 295 121 130 365 667 1004 1297 8565
60 1146 945 867 603 373 171 46 55 235 515 854 1142 6953
57 1053 860 774 514 290 110 22 31 170 426 764 1049 6063
55 991 804 712 455 238 78 13 20 134 369 704 987 5505
50 837 663 557 315 128 25 2 5 66 239 556 832 4225
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