PORT TOWNSEND, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(456678) PORT TOWNSEND
From Year=1948 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 87 106 175 284 448 555 680 689 562 367 172 91 4215
40 S 87 194 369 653 1100 1655 2335 3024 3586 3952 4124 4215 4215
45 M 20 26 57 139 293 405 525 534 412 214 59 20 2704
45 S 20 45 103 242 535 940 1464 1998 2410 2625 2684 2704 2704
50 M 2 2 7 40 146 255 370 379 263 83 8 1 1555
50 S 2 4 11 51 197 452 821 1200 1463 1546 1554 1555 1555
55 M 0 0 0 6 45 114 215 224 122 15 0 0 742
55 S 0 0 0 6 51 166 381 605 727 742 742 742 742
60 M 0 0 0 0 9 29 79 84 32 1 0 0 233
60 S 0 0 0 0 9 38 117 201 232 233 233 233 233
Corn Growing Degree Days
50 M 9 18 47 107 203 276 375 384 287 138 32 7 1882
50 S 9 26 73 180 383 659 1034 1418 1706 1843 1875 1882 1882
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