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=2012
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 104 119 203 323 502 630 800 819 661 424 202 91 4878
40 S 104 224 427 750 1252 1881 2681 3500 4161 4585 4787 4878 4878
45 M 27 33 77 177 347 480 645 664 511 272 83 21 3335
45 S 27 60 137 314 660 1140 1785 2448 2960 3231 3314 3335 3335
50 M 3 3 15 64 196 330 490 509 361 132 19 2 2123
50 S 3 6 20 85 280 610 1100 1608 1970 2102 2121 2123 2123
55 M 0 0 1 14 80 183 335 354 213 38 2 0 1219
55 S 0 0 1 15 95 278 613 966 1179 1217 1219 1219 1219
60 M 0 0 0 2 22 66 182 200 87 4 0 0 563
60 S 0 0 0 2 23 89 271 471 558 563 563 563 563
Corn Growing Degree Days
50 M 15 32 69 133 237 336 486 507 369 176 46 10 2417
50 S 15 48 117 250 487 823 1309 1816 2185 2361 2407 2417 2417
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