SITKUM, OREGON

Period of Record General Climate Summary - Growing Degree Days

Station:(357866) SITKUM
From Year=1944 To Year=1969
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 99 152 183 292 453 575 711 726 620 443 219 137 4610
40 S 99 250 433 725 1178 1753 2464 3190 3810 4253 4472 4610 4610
45 M 31 61 72 154 299 425 556 571 470 291 100 49 3079
45 S 31 92 163 317 616 1041 1598 2168 2639 2929 3029 3079 3079
50 M 4 14 18 58 157 276 401 416 321 153 29 9 1857
50 S 4 18 36 94 251 527 929 1344 1665 1818 1847 1857 1857
55 M 0 2 3 16 56 138 247 261 178 56 4 1 961
55 S 0 2 4 20 77 215 461 722 901 956 961 961 961
60 M 0 0 0 3 13 45 105 118 67 12 0 0 365
60 S 0 0 0 4 17 62 167 285 352 365 365 365 365
Corn Growing Degree Days
50 M 30 65 88 163 252 332 437 445 376 237 88 41 2555
50 S 30 95 183 346 598 930 1367 1812 2188 2425 2513 2555 2555
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