COLVILLE AP, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(451650) COLVILLE AIRPORT
From Year=1937 To Year=1987
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 2 7 50 210 461 648 871 834 548 215 19 3 3867
40 S 2 8 58 268 728 1377 2248 3082 3630 3845 3863 3867 3867
45 M 0 1 10 99 310 498 716 679 399 104 3 1 2820
45 S 0 1 11 110 419 918 1634 2313 2713 2817 2819 2820 2820
50 M 0 0 1 34 178 350 561 524 260 37 0 0 1946
50 S 0 0 1 35 213 563 1124 1648 1908 1945 1946 1946 1946
55 M 0 0 0 8 82 211 407 370 144 8 0 0 1232
55 S 0 0 0 8 90 302 709 1079 1224 1232 1232 1232 1232
60 M 0 0 0 2 28 103 260 224 62 1 0 0 679
60 S 0 0 0 2 30 132 392 616 678 679 679 679 679
Corn Growing Degree Days
50 M 0 3 37 148 291 397 540 520 358 144 5 1 2443
50 S 0 3 40 188 479 876 1416 1936 2293 2438 2443 2443 2443
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