BOISE WSFO AIRPORT, IDAHO

Period of Record General Climate Summary - Growing Degree Days

Station:(101022) BOISE WSFO AIRPORT
From Year=1940 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 15 37 129 291 552 773 1068 1018 700 384 85 19 5069
40 S 15 52 181 472 1023 1796 2864 3882 4582 4965 5050 5069 5069
45 M 3 9 53 169 400 623 913 863 551 247 31 5 3865
45 S 3 12 64 233 633 1256 2169 3032 3582 3829 3860 3865 3865
50 M 0 1 16 84 262 473 758 708 405 138 8 0 2854
50 S 0 2 17 101 363 837 1595 2303 2708 2846 2853 2854 2854
55 M 0 0 3 34 150 330 603 553 271 62 1 0 2007
55 S 0 0 3 37 187 517 1120 1673 1944 2006 2007 2007 2007
60 M 0 0 0 10 73 204 449 401 158 21 0 0 1317
60 S 0 0 0 10 83 288 737 1138 1295 1317 1317 1317 1317
Corn Growing Degree Days
50 M 4 18 78 180 337 475 671 642 437 237 41 5 3125
50 S 4 21 100 280 617 1092 1763 2405 2842 3079 3120 3125 3125
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