KETCHIKAN, ALASKA

Period of Record General Climate Summary - Growing Degree Days

Station:(504590) KETCHIKAN
From Year=1949 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 21 22 28 105 277 431 560 571 408 202 63 29 2716
40 S 21 43 70 175 452 884 1443 2014 2422 2624 2687 2716 2716
45 M 2 3 2 27 134 282 405 416 259 78 13 4 1625
45 S 2 5 8 35 169 451 855 1272 1531 1608 1622 1625 1625
50 M 0 0 0 5 44 139 250 262 119 14 2 0 835
50 S 0 1 1 6 50 189 439 700 819 833 835 835 835
55 M 0 0 0 1 10 45 108 116 28 1 0 0 309
55 S 0 0 0 1 11 56 164 280 309 309 309 309 309
60 M 0 0 0 0 2 12 30 32 3 0 0 0 78
60 S 0 0 0 0 2 14 44 76 78 78 78 78 78
Corn Growing Degree Days
50 M 2 3 4 34 105 181 264 275 160 43 7 2 1080
50 S 2 4 8 43 148 329 593 868 1028 1071 1078 1080 1080
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