SEATTLE SAND PT WSFO, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(457470) SEATTLE SAND PT WSFO
From Year=1986 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 109 123 214 340 516 638 798 820 662 433 204 94 4951
40 S 109 232 446 786 1302 1940 2738 3558 4220 4653 4857 4951 4951
45 M 29 35 84 192 361 488 643 665 512 280 83 22 3393
45 S 29 64 148 340 701 1189 1832 2497 3009 3289 3371 3393 3393
50 M 3 4 17 73 210 338 488 510 362 140 18 2 2164
50 S 3 7 24 97 306 644 1132 1643 2004 2144 2162 2164 2164
55 M 0 0 1 17 88 191 333 355 214 42 1 0 1242
55 S 0 0 2 18 106 297 630 985 1199 1241 1242 1242 1242
60 M 0 0 0 2 25 70 181 201 88 5 0 0 572
60 S 0 0 0 2 27 97 278 479 567 572 572 572 572
Corn Growing Degree Days
50 M 17 34 76 141 245 343 486 509 370 182 46 11 2459
50 S 17 51 126 267 512 856 1341 1850 2220 2402 2448 2459 2459
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