LEWISTON WSO AP, IDAHO

Period of Record General Climate Summary - Growing Degree Days

Station:(105241) LEWISTON WSO AP
From Year=1948 To Year=2006
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 32 59 156 327 577 778 1054 1027 722 373 98 30 5234
40 S 32 92 248 575 1152 1930 2984 4011 4733 5105 5203 5234 5234
45 M 6 16 61 189 423 628 899 872 572 231 33 6 3936
45 S 6 22 83 272 695 1323 2222 3094 3666 3896 3930 3936 3936
50 M 1 2 16 89 276 478 744 717 424 116 7 1 2870
50 S 1 3 19 108 384 862 1606 2323 2746 2862 2869 2870 2870
55 M 0 0 2 34 153 331 589 562 283 46 1 0 2002
55 S 0 0 2 36 190 521 1110 1672 1955 2001 2002 2002 2002
60 M 0 0 0 9 71 198 435 409 163 14 0 0 1299
60 S 0 0 0 9 80 279 714 1123 1285 1299 1299 1299 1299
Corn Growing Degree Days
50 M 7 23 81 185 334 473 661 645 441 206 34 7 3096
50 S 7 30 111 296 630 1103 1764 2409 2850 3056 3089 3096 3096
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 Jul 28, 2006
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