WALLA WALLA FAA AIRPORT, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(458928) WALLA WALLA FAA AIRPORT
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 56 82 191 361 597 804 1078 1055 761 434 133 59 5610
40 S 56 138 329 690 1287 2091 3169 4223 4984 5418 5552 5610 5610
45 M 20 29 82 218 442 654 923 900 611 286 56 20 4241
45 S 20 49 131 349 792 1445 2368 3268 3879 4165 4221 4241 4241
50 M 5 7 25 107 292 504 768 745 462 159 16 4 3094
50 S 5 12 37 144 436 940 1708 2453 2914 3073 3089 3094 3094
55 M 1 1 5 43 165 356 613 590 318 70 3 1 2165
55 S 1 2 7 50 215 571 1184 1773 2091 2161 2165 2165 2165
60 M 0 0 1 13 78 220 459 435 190 24 0 0 1420
60 S 0 0 1 14 92 312 771 1206 1396 1419 1420 1420 1420
Corn Growing Degree Days
50 M 19 31 91 196 342 491 683 676 469 234 50 20 3301
50 S 19 50 141 337 679 1170 1853 2528 2997 3231 3281 3301 3301
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