LEWISTON WSO AP, IDAHO

Period of Record General Climate Summary - Growing Degree Days

Station:(105241) LEWISTON WSO AP
From Year=1948 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 59 156 325 577 777 1061 1032 730 373 99 30 5252
40 S 33 92 249 573 1150 1927 2989 4020 4750 5123 5222 5252 5252
45 M 7 15 61 188 423 627 906 877 580 231 34 6 3954
45 S 7 22 83 270 693 1320 2226 3103 3683 3914 3948 3954 3954
50 M 1 2 16 88 276 477 751 722 432 116 7 1 2889
50 S 1 3 19 107 383 860 1611 2333 2765 2881 2888 2889 2889
55 M 0 0 2 34 154 331 596 567 290 46 1 0 2021
55 S 0 0 2 36 190 521 1117 1684 1974 2020 2021 2021 2021
60 M 0 0 0 9 72 198 442 413 168 14 0 0 1317
60 S 0 0 0 10 81 279 721 1134 1303 1317 1317 1317 1317
Corn Growing Degree Days
50 M 7 23 81 183 334 472 666 648 446 206 34 7 3107
50 S 7 30 111 294 628 1100 1767 2414 2860 3066 3100 3107 3107
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