ATTU N A U, ALASKA

Period of Record General Climate Summary - Growing Degree Days

Station:(500452) ATTU N A U
From Year=1949 To Year=1993
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 18 121 257 325 235 89 8 1 1059
40 S 0 1 1 4 22 143 400 726 960 1050 1058 1059 1059
45 M 0 0 0 1 0 25 107 173 97 19 0 0 422
45 S 0 0 0 1 1 26 132 306 403 422 422 422 422
50 M 0 0 0 0 0 2 21 49 17 1 0 0 90
50 S 0 0 0 0 0 3 24 72 89 90 90 90 90
55 M 0 0 0 0 0 0 2 6 1 0 0 0 9
55 S 0 0 0 0 0 0 2 8 9 9 9 9 9
60 M 0 0 0 0 0 0 0 0 0 0 0 0 1
60 S 0 0 0 0 0 0 0 0 1 1 1 1 1
Corn Growing Degree Days
50 M 0 0 0 1 1 18 52 85 43 10 0 0 209
50 S 0 0 0 1 2 20 72 156 199 209 209 209 209
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