SPOKANE WSO AIRPORT, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(457938) SPOKANE WSO AIRPORT
From Year=1889 To Year=2006
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 6 13 70 229 475 665 925 888 585 274 42 9 4181
40 S 6 18 88 317 793 1458 2383 3271 3856 4130 4172 4181 4181
45 M 1 2 20 117 325 515 770 733 437 150 10 1 3082
45 S 1 3 23 140 465 980 1751 2483 2920 3070 3081 3082 3082
50 M 0 0 3 49 192 366 616 578 294 65 1 0 2165
50 S 0 0 4 52 244 611 1226 1804 2098 2163 2165 2165 2165
55 M 0 0 0 16 95 228 461 424 171 21 0 0 1417
55 S 0 0 0 16 111 340 801 1225 1396 1417 1417 1417 1417
60 M 0 0 0 4 38 118 312 277 82 5 0 0 836
60 S 0 0 0 4 42 161 472 749 831 836 836 836 836
Corn Growing Degree Days
50 M 1 4 38 133 271 392 583 556 350 154 11 1 2493
50 S 1 4 42 175 446 838 1421 1977 2327 2481 2492 2493 2493
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 Jul 28, 2006
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