PRIEST RAPIDS DAM, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(456747) PRIEST RAPIDS DAM
From Year=1956 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 33 69 236 440 719 924 1177 1155 847 469 134 34 6236
40 S 33 102 337 777 1497 2420 3598 4752 5599 6068 6202 6236 6236
45 M 8 19 113 291 564 774 1022 1000 697 320 55 9 4873
45 S 8 27 140 432 996 1770 2792 3791 4488 4808 4864 4873 4873
50 M 1 3 34 159 410 624 867 845 547 186 14 1 3691
50 S 1 4 39 197 607 1231 2098 2943 3489 3675 3690 3691 3691
55 M 0 0 6 66 263 474 712 690 398 86 3 0 2697
55 S 0 0 6 72 335 809 1521 2211 2609 2695 2697 2697 2697
60 M 0 0 0 19 142 327 557 535 257 30 0 0 1867
60 S 0 0 0 19 161 488 1045 1580 1836 1866 1867 1867 1867
Corn Growing Degree Days
50 M 15 32 127 245 428 590 762 755 542 263 53 14 3826
50 S 15 47 175 420 848 1438 2200 2955 3497 3760 3813 3826 3826
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