BOISE WSFO AIRPORT, IDAHO

Period of Record General Climate Summary - Growing Degree Days

Station:(101022) BOISE WSFO AIRPORT
From Year=1940 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 15 37 132 292 555 778 1082 1027 711 385 88 18 5120
40 S 15 52 183 476 1031 1809 2891 3918 4629 5014 5102 5120 5120
45 M 2 9 54 170 404 628 927 872 561 248 33 5 3913
45 S 2 11 66 235 639 1268 2194 3066 3628 3876 3908 3913 3913
50 M 0 1 17 84 266 479 772 717 416 139 9 0 2899
50 S 0 1 18 103 368 847 1619 2336 2751 2890 2899 2899 2899
55 M 0 0 3 35 153 335 617 562 281 63 1 0 2050
55 S 0 0 3 38 191 526 1143 1705 1986 2048 2050 2050 2050
60 M 0 0 0 11 76 209 463 410 165 22 0 0 1355
60 S 0 0 0 11 87 295 758 1168 1333 1355 1355 1355 1355
Corn Growing Degree Days
50 M 4 17 79 180 338 479 680 648 444 236 42 5 3153
50 S 4 21 100 280 618 1097 1777 2425 2870 3105 3148 3153 3153
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