ST HELENS RFD, OREGON

Period of Record General Climate Summary - Growing Degree Days

Station:(357466) ST HELENS RFD
From Year=1976 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 67 112 242 358 541 695 881 893 720 456 177 63 5206
40 S 67 179 422 779 1320 2015 2896 3789 4509 4965 5143 5206 5206
45 M 16 35 115 216 387 545 726 738 570 304 73 15 3740
45 S 16 51 166 382 769 1314 2040 2778 3348 3652 3725 3740 3740
50 M 2 6 37 104 241 395 571 583 420 166 19 2 2547
50 S 2 8 45 149 390 785 1356 1940 2359 2526 2545 2547 2547
55 M 0 1 5 39 126 250 416 429 272 67 2 0 1607
55 S 0 1 6 45 170 421 837 1265 1537 1605 1607 1607 1607
60 M 0 0 0 10 55 129 265 275 146 18 0 0 898
60 S 0 0 0 10 65 194 459 734 880 898 898 898 898
Corn Growing Degree Days
50 M 15 47 120 199 307 406 543 557 432 242 59 10 2938
50 S 15 61 181 381 687 1094 1637 2195 2626 2869 2928 2938 2938
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