POLEBRIDGE, MONTANA

Period of Record General Climate Summary - Growing Degree Days

Station:(246615) POLEBRIDGE
From Year=1933 To Year=2012
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 1 5 62 251 435 628 589 318 92 5 0 2387
40 S 0 1 6 68 319 754 1383 1972 2290 2382 2387 2387 2387
45 M 0 0 0 18 130 288 474 434 189 32 1 0 1566
45 S 0 0 0 19 149 436 910 1344 1533 1565 1566 1566 1566
50 M 0 0 0 4 50 155 320 282 88 6 0 0 906
50 S 0 0 0 4 54 209 529 812 900 906 906 906 906
55 M 0 0 0 0 13 64 180 148 29 1 0 0 436
55 S 0 0 0 0 14 78 258 407 435 436 436 436 436
60 M 0 0 0 0 3 19 73 52 6 0 0 0 153
60 S 0 0 0 0 3 21 94 147 152 153 153 153 153
Corn Growing Degree Days
50 M 0 1 14 82 214 307 450 441 281 112 5 0 1909
50 S 0 2 16 98 311 618 1068 1510 1791 1903 1908 1909 1909
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 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