WALLA WALLA WSO, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(458931) WALLA WALLA WB CITY
From Year=1916 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 67 101 203 367 615 823 1087 1047 740 431 150 74 5707
40 S 67 167 370 738 1353 2175 3263 4310 5051 5482 5632 5707 5707
45 M 27 40 90 225 460 673 932 892 591 284 67 29 4311
45 S 27 67 157 382 842 1515 2447 3340 3931 4215 4282 4311 4311
50 M 8 11 29 112 309 523 777 737 442 157 20 7 3134
50 S 8 19 48 160 469 992 1769 2507 2949 3106 3126 3134 3134
55 M 1 2 7 46 179 375 622 583 300 68 4 1 2188
55 S 1 3 10 56 235 610 1232 1815 2115 2182 2186 2188 2188
60 M 0 0 1 15 87 237 468 428 175 22 1 0 1435
60 S 0 0 1 16 104 341 809 1237 1412 1434 1434 1435 1435
Corn Growing Degree Days
50 M 22 37 92 194 352 508 697 675 453 230 54 26 3339
50 S 22 59 151 345 697 1205 1902 2577 3030 3260 3314 3339 3339
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