SWAN FALLS POWER HOUSE, IDAHO

Period of Record General Climate Summary - Growing Degree Days

Station:(108928) SWAN FALLS POWER HOUSE
From Year=1935 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 24 66 212 417 703 915 1233 1169 834 492 131 29 6224
40 S 24 90 302 719 1421 2336 3570 4739 5572 6064 6195 6224 6224
45 M 6 20 100 274 548 765 1078 1014 684 343 55 8 4894
45 S 6 25 126 400 947 1712 2791 3805 4488 4831 4886 4894 4894
50 M 1 4 36 154 397 615 923 859 534 210 16 1 3750
50 S 1 5 40 195 591 1207 2130 2989 3523 3733 3748 3750 3750
55 M 0 0 8 73 258 467 768 704 388 107 2 0 2776
55 S 0 0 9 81 339 806 1574 2278 2666 2773 2775 2776 2776
60 M 0 0 1 26 146 324 613 549 253 42 0 0 1955
60 S 0 0 1 27 173 497 1111 1660 1913 1955 1955 1955 1955
Corn Growing Degree Days
50 M 9 38 136 258 430 569 764 721 520 311 73 12 3841
50 S 9 48 183 441 871 1441 2205 2926 3446 3756 3829 3841 3841
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