PORTHILL, IDAHO

Period of Record General Climate Summary - Growing Degree Days

Station:(107264) PORTHILL
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 2 3 32 191 449 622 821 782 484 161 20 2 3570
40 S 2 5 37 228 677 1300 2121 2903 3387 3548 3568 3570 3570
45 M 0 0 4 84 299 473 666 627 337 65 3 0 2557
45 S 0 0 4 88 387 859 1526 2152 2489 2554 2557 2557 2557
50 M 0 0 0 26 167 325 511 472 201 17 0 0 1719
50 S 0 0 0 27 194 518 1030 1501 1702 1719 1719 1719 1719
55 M 0 0 0 6 75 189 358 320 95 2 0 0 1044
55 S 0 0 0 6 80 269 627 947 1042 1044 1044 1044 1044
60 M 0 0 0 1 23 86 214 181 31 0 0 0 536
60 S 0 0 0 1 24 110 324 505 536 536 536 536 536
Corn Growing Degree Days
50 M 0 1 27 139 285 377 509 491 323 111 6 0 2268
50 S 0 1 28 167 452 829 1338 1829 2152 2262 2268 2268 2268
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