VASHON ISLAND, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(458802) VASHON ISLAND
From Year=1891 To Year=1955
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 58 77 147 272 442 568 710 706 555 358 174 82 4148
40 S 58 135 282 554 996 1564 2274 2980 3534 3892 4066 4148 4148
45 M 14 18 46 135 288 418 555 551 405 207 66 21 2721
45 S 14 32 78 212 500 917 1473 2023 2428 2635 2701 2721 2721
50 M 2 2 9 44 143 268 400 396 256 85 12 2 1618
50 S 2 4 13 57 200 468 868 1263 1519 1604 1616 1618 1618
55 M 0 0 1 10 46 128 245 241 121 20 1 0 814
55 S 0 1 2 12 58 186 431 672 793 813 814 814 814
60 M 0 0 0 1 9 38 104 102 35 3 0 0 293
60 S 0 0 0 2 11 48 153 255 290 293 293 293 293
Corn Growing Degree Days
50 M 8 16 52 130 227 308 415 408 291 139 41 11 2048
50 S 8 25 77 207 434 742 1157 1566 1856 1996 2037 2048 2048
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