COLVILLE BASIC, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(451630) COLVILLE
From Year=1899 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 1 4 71 260 492 654 874 821 554 239 28 3 4002
40 S 1 6 77 336 829 1482 2356 3176 3730 3970 3998 4002 4002
45 M 0 0 18 136 339 504 719 666 405 123 7 0 2916
45 S 0 0 18 154 493 996 1715 2381 2786 2908 2915 2916 2916
50 M 0 0 2 55 199 354 564 511 264 45 1 0 1995
50 S 0 0 2 57 256 610 1174 1685 1948 1994 1995 1995 1995
55 M 0 0 0 17 94 213 409 358 143 11 0 0 1245
55 S 0 0 0 17 111 324 734 1091 1234 1245 1245 1245 1245
60 M 0 0 0 3 32 99 260 213 58 2 0 0 667
60 S 0 0 0 3 36 135 395 608 665 667 667 667 667
Corn Growing Degree Days
50 M 0 2 63 206 336 420 546 525 382 173 11 1 2665
50 S 0 3 66 272 608 1027 1574 2098 2480 2654 2664 2665 2665
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