SPOKANE, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(457933) SPOKANE
From Year=1953 To Year=1983
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 10 29 83 245 513 719 958 917 624 297 54 14 4462
40 S 10 40 123 368 881 1600 2558 3475 4098 4395 4449 4462 4462
45 M 1 6 26 126 361 569 803 762 474 165 14 2 3310
45 S 1 7 33 160 521 1090 1893 2655 3130 3294 3308 3310 3310
50 M 0 0 6 53 225 420 648 607 330 74 2 0 2366
50 S 0 1 6 60 285 705 1353 1960 2290 2364 2366 2366 2366
55 M 0 0 1 19 121 279 494 453 201 26 0 0 1593
55 S 0 0 1 20 141 419 913 1365 1567 1593 1593 1593 1593
60 M 0 0 0 5 55 160 343 305 103 6 0 0 978
60 S 0 0 0 5 60 220 563 869 971 978 978 978 978
Corn Growing Degree Days
50 M 1 11 47 144 299 432 596 568 379 168 15 2 2662
50 S 1 12 58 202 502 934 1530 2099 2477 2645 2660 2662 2662
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