PRIEST RAPIDS DAM, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(456747) PRIEST RAPIDS DAM
From Year=1956 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 33 68 233 435 717 919 1182 1156 852 469 136 32 6233
40 S 33 101 334 769 1487 2406 3588 4744 5596 6065 6201 6233 6233
45 M 8 18 110 287 562 769 1027 1001 702 320 57 9 4871
45 S 8 27 137 424 986 1755 2783 3783 4485 4806 4863 4871 4871
50 M 1 3 33 155 408 619 872 846 552 186 15 1 3692
50 S 1 4 37 192 599 1219 2091 2936 3489 3675 3690 3692 3692
55 M 0 0 5 64 261 469 717 691 403 85 3 0 2699
55 S 0 0 6 70 330 800 1517 2208 2611 2696 2699 2699 2699
60 M 0 0 0 18 140 322 562 536 261 29 0 0 1870
60 S 0 0 0 19 159 481 1043 1579 1840 1869 1870 1870 1870
Corn Growing Degree Days
50 M 15 31 124 241 426 587 766 757 546 261 55 13 3823
50 S 15 46 171 411 838 1425 2191 2948 3494 3755 3810 3823 3823
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