LEWISTON WATER PLANT, IDAHO

Period of Record General Climate Summary - Growing Degree Days

Station:(105236) LEWISTON WATER PLANT
From Year=1894 To Year=1955
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 30 53 171 405 654 808 1113 1067 758 420 109 36 5625
40 S 30 84 255 660 1314 2122 3235 4302 5060 5480 5589 5625 5625
45 M 5 11 71 260 499 658 958 912 608 274 37 6 4300
45 S 5 16 87 347 846 1504 2462 3375 3983 4257 4294 4300 4300
50 M 1 1 20 135 347 508 803 757 460 148 6 0 3186
50 S 1 1 22 157 504 1012 1815 2572 3032 3180 3185 3186 3186
55 M 0 0 3 53 209 359 648 602 316 58 0 0 2249
55 S 0 0 3 56 265 624 1272 1875 2191 2249 2249 2249 2249
60 M 0 0 0 15 101 220 493 448 187 14 0 0 1479
60 S 0 0 0 15 117 336 830 1278 1465 1479 1479 1479 1479
Corn Growing Degree Days
50 M 10 29 110 256 405 498 678 646 471 260 50 10 3424
50 S 10 38 149 405 810 1308 1986 2632 3103 3364 3414 3424 3424
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