CHIEF JOSEPH DAM, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(451400) CHIEF JOSEPH DAM
From Year=1949 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 2 11 118 329 599 794 1040 1021 714 334 54 4 5020
40 S 2 13 131 460 1060 1854 2893 3914 4628 4962 5016 5020 5020
45 M 0 1 39 190 445 644 885 866 564 197 14 0 3845
45 S 0 1 40 230 674 1318 2203 3069 3633 3830 3844 3845 3845
50 M 0 0 8 85 294 494 730 711 415 92 2 0 2831
50 S 0 0 8 92 387 881 1610 2321 2736 2828 2831 2831 2831
55 M 0 0 1 27 165 346 575 556 273 33 0 0 1975
55 S 0 0 1 28 192 538 1113 1668 1942 1975 1975 1975 1975
60 M 0 0 0 6 74 208 421 402 152 8 0 0 1270
60 S 0 0 0 6 80 288 709 1110 1262 1270 1270 1270 1270
Corn Growing Degree Days
50 M 1 6 78 212 368 492 651 637 452 211 22 1 3130
50 S 1 7 85 296 664 1156 1807 2444 2896 3107 3129 3130 3130
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