SEATTLE UNIV OF WASH, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(457478) SEATTLE UNIV OF WASHING
From Year=1909 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 76 105 181 312 502 632 778 772 619 419 191 106 4693
40 S 76 181 362 674 1176 1808 2586 3358 3977 4396 4587 4693 4693
45 M 20 31 67 171 348 482 623 617 469 266 78 30 3202
45 S 20 51 118 289 637 1119 1742 2359 2828 3094 3172 3202 3202
50 M 2 4 15 67 201 332 468 462 320 129 17 3 2020
50 S 2 7 21 88 289 621 1090 1551 1871 2000 2017 2020 2020
55 M 0 0 2 19 87 187 313 307 178 41 2 0 1135
55 S 0 0 2 20 107 294 607 915 1092 1133 1135 1135 1135
60 M 0 0 0 3 28 75 166 160 69 7 0 0 508
60 S 0 0 0 3 31 106 272 431 501 508 508 508 508
Corn Growing Degree Days
50 M 12 28 65 141 251 341 465 459 333 179 47 16 2337
50 S 12 40 105 245 497 838 1303 1762 2095 2274 2321 2337 2337
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