HILLSBORO, OREGON

Period of Record General Climate Summary - Growing Degree Days

Station:(353908) HILLSBORO
From Year=1929 To Year=2003
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 71 109 199 328 508 642 820 807 650 402 168 84 4788
40 S 71 180 379 708 1216 1858 2678 3485 4135 4537 4705 4788 4788
45 M 20 34 83 187 354 492 665 652 500 252 70 25 3334
45 S 20 55 137 324 678 1170 1835 2487 2987 3239 3309 3334 3334
50 M 3 6 21 81 210 342 510 497 351 124 17 4 2166
50 S 3 8 30 111 321 663 1172 1670 2021 2145 2162 2166 2166
55 M 0 0 3 26 100 199 355 343 209 42 2 0 1278
55 S 0 0 3 29 129 328 683 1025 1234 1276 1278 1278 1278
60 M 0 0 0 6 38 92 206 195 95 9 0 0 641
60 S 0 0 0 6 44 136 343 538 632 641 641 641 641
Corn Growing Degree Days
50 M 15 41 98 184 295 376 503 498 397 227 60 17 2710
50 S 15 55 153 337 632 1008 1511 2009 2406 2633 2693 2710 2710
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