ST MARYS, ALASKA

Period of Record General Climate Summary - Growing Degree Days

Station:(508105) ST MARYS
From Year=1967 To Year=2000
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 0 3 144 324 473 412 168 11 0 0 1535
40 S 0 0 0 3 147 471 944 1356 1524 1534 1535 1535 1535
45 M 0 0 0 1 64 187 318 259 68 1 0 0 897
45 S 0 0 0 1 65 252 570 829 897 897 897 897 897
50 M 0 0 0 0 23 85 171 124 15 0 0 0 418
50 S 0 0 0 0 23 108 280 403 418 418 418 418 418
55 M 0 0 0 0 7 28 70 36 2 0 0 0 143
55 S 0 0 0 0 7 36 106 141 143 143 143 143 143
60 M 0 0 0 0 2 8 20 6 0 0 0 0 36
60 S 0 0 0 0 2 9 29 35 36 36 36 36 36
Corn Growing Degree Days
50 M 0 0 0 2 81 158 224 187 74 2 0 0 729
50 S 0 0 0 2 83 241 466 653 727 729 729 729 729
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