OLYMPIA AP, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(456114) OLYMPIA WSO AP
From Year=1948 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 60 74 128 231 421 561 722 722 554 315 128 59 3976
40 S 60 134 262 493 914 1476 2198 2920 3473 3788 3917 3976 3976
45 M 15 19 38 104 268 411 567 567 404 172 45 15 2625
45 S 15 33 71 175 443 854 1422 1988 2392 2565 2610 2625 2625
50 M 1 2 6 33 133 262 412 412 256 66 9 2 1595
50 S 1 4 10 43 177 439 851 1263 1519 1584 1593 1595 1595
55 M 0 0 0 7 50 127 258 257 123 14 1 0 838
55 S 0 0 1 8 58 185 443 700 823 837 838 838 838
60 M 0 0 0 1 14 43 120 117 37 1 0 0 334
60 S 0 0 0 1 14 58 178 295 332 334 334 334 334
Corn Growing Degree Days
50 M 10 28 68 135 244 318 434 436 333 166 39 9 2220
50 S 10 39 106 241 485 804 1238 1674 2006 2173 2211 2220 2220
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