SEATTLE UNIV OF WASHING, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(457478) SEATTLE UNIV OF WASHING
From Year=1948 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 75 124 188 314 524 649 805 804 646 424 201 109 4864
40 S 75 199 387 701 1225 1874 2680 3484 4130 4554 4755 4864 4864
45 M 20 40 69 170 369 499 650 649 496 271 85 31 3350
45 S 20 60 129 300 669 1168 1818 2468 2964 3234 3320 3350 3350
50 M 2 6 14 65 219 349 495 494 346 132 20 3 2147
50 S 2 8 22 87 306 655 1151 1645 1991 2123 2144 2147 2147
55 M 0 0 1 17 101 203 340 339 201 42 2 0 1247
55 S 0 0 1 19 119 322 663 1002 1203 1245 1247 1247 1247
60 M 0 0 0 3 35 86 190 188 85 7 0 0 594
60 S 0 0 0 3 38 124 314 502 587 594 594 594 594
Corn Growing Degree Days
50 M 11 35 68 143 268 356 491 487 357 183 52 16 2467
50 S 11 46 114 257 525 881 1372 1859 2215 2398 2451 2467 2467
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