WEST YELLOWSTONE, MONTANA

Period of Record General Climate Summary - Growing Degree Days

Station:(248857) WEST YELLOWSTONE
From Year=1924 To Year=1996
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 0 0 1 20 163 361 602 533 255 52 1 0 1988
40 S 0 0 1 21 184 545 1147 1680 1935 1987 1988 1988 1988
45 M 0 0 0 4 71 225 447 379 137 12 0 0 1275
45 S 0 0 0 4 75 300 747 1126 1263 1275 1275 1275 1275
50 M 0 0 0 0 21 114 295 232 52 1 0 0 715
50 S 0 0 0 0 21 135 430 662 714 715 715 715 715
55 M 0 0 0 0 3 41 154 105 12 0 0 0 314
55 S 0 0 0 0 3 44 198 303 314 314 314 314 314
60 M 0 0 0 0 0 9 50 26 1 0 0 0 85
60 S 0 0 0 0 0 9 59 84 85 85 85 85 85
Corn Growing Degree Days
50 M 0 0 5 41 163 281 448 419 254 95 4 0 1711
50 S 0 0 5 46 209 490 938 1357 1612 1707 1711 1711 1711
M = Monthly Data
S - Running sum of monthly data.
Growing 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.
Corn Growing Degree Day units have the limitations that the maximum daily temperatures greater than 86 F are set to 86 F and minimums less than 50 F are set to 50 F.
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