SKAGIT POWER PLANT, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(457690) SKAGIT POWER PLANT
From Year=1931 To Year=1958
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 10 35 101 297 525 627 786 784 625 361 100 22 4272
40 S 10 45 146 443 968 1595 2380 3164 3789 4150 4250 4272 4272
45 M 1 8 34 166 371 477 631 629 475 218 29 2 3040
45 S 1 9 43 209 580 1056 1687 2316 2791 3009 3038 3040 3040
50 M 0 1 10 74 227 328 476 474 327 104 4 0 2024
50 S 0 1 11 85 312 640 1116 1589 1916 2020 2024 2024 2024
55 M 0 0 2 25 113 189 322 319 194 35 0 0 1199
55 S 0 0 2 27 140 329 651 970 1164 1199 1199 1199 1199
60 M 0 0 0 7 45 87 181 175 94 7 0 0 595
60 S 0 0 0 7 52 139 319 494 588 595 595 595 595
Corn Growing Degree Days
50 M 1 14 54 171 301 353 467 465 354 159 22 2 2364
50 S 1 15 69 240 541 893 1361 1826 2180 2339 2362 2364 2364
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