TROUTDALE SUBSTATION, OREGON

Period of Record General Climate Summary - Growing Degree Days

Station:(358634) TROUTDALE SUBSTATION
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 79 119 230 352 542 692 865 858 686 453 201 84 5162
40 S 79 198 429 781 1322 2014 2879 3737 4424 4877 5078 5162 5162
45 M 24 38 102 207 387 542 710 703 536 301 89 23 3662
45 S 24 61 163 370 757 1299 2008 2712 3248 3549 3639 3662 3662
50 M 4 7 29 91 237 392 555 548 387 162 24 3 2440
50 S 4 11 40 131 369 761 1315 1864 2250 2413 2436 2440 2440
55 M 0 1 4 30 118 245 400 393 241 63 3 0 1498
55 S 0 1 5 35 152 397 796 1190 1431 1494 1498 1498 1498
60 M 0 0 0 7 46 124 247 241 118 16 0 0 799
60 S 0 0 0 7 53 177 424 665 783 799 799 799 799
Corn Growing Degree Days
50 M 20 39 106 182 297 400 534 530 413 237 67 19 2843
50 S 20 59 165 346 644 1044 1578 2107 2520 2757 2825 2843 2843
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