SWAN VALLEY 2 E, IDAHO

Period of Record General Climate Summary - Growing Degree Days

Station:(108937) SWAN VALLEY 2 E
From Year=1960 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 0 2 18 112 320 531 768 727 453 177 20 1 3129
40 S 0 2 20 133 452 983 1751 2478 2931 3108 3128 3129 3129
45 M 0 0 3 48 189 382 613 572 312 83 4 0 2205
45 S 0 0 3 51 240 622 1235 1807 2119 2202 2205 2205 2205
50 M 0 0 0 15 90 243 458 418 185 27 0 0 1435
50 S 0 0 0 15 104 347 804 1223 1408 1434 1435 1435 1435
55 M 0 0 0 3 32 127 305 269 86 4 0 0 826
55 S 0 0 0 3 35 162 467 736 822 826 826 826 826
60 M 0 0 0 0 7 48 164 134 28 0 0 0 382
60 S 0 0 0 0 7 55 220 354 382 382 382 382 382
Corn Growing Degree Days
50 M 0 2 21 107 242 370 519 505 353 180 21 0 2319
50 S 0 2 23 130 372 742 1260 1765 2118 2298 2319 2319 2319
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