WILLOW SPRINGS RCH, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(029382) WILLOW SPRINGS RANCH
From Year=1943 To Year=1978
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 191 236 390 605 864 1119 1279 1196 1039 779 410 212 8318
40 S 191 426 816 1421 2285 3404 4683 5879 6918 7697 8106 8318 8318
45 M 86 128 252 457 709 969 1124 1041 889 625 273 101 6653
45 S 86 214 465 923 1632 2601 3725 4766 5655 6280 6553 6653 6653
50 M 26 55 136 316 555 819 969 886 739 473 156 31 5161
50 S 26 81 217 533 1088 1908 2877 3762 4501 4974 5130 5161 5161
55 M 5 17 57 190 404 669 814 731 589 327 70 5 3878
55 S 5 22 78 269 673 1342 2156 2887 3476 3803 3873 3878 3878
60 M 1 2 17 93 262 520 659 576 441 197 20 0 2788
60 S 1 3 20 113 375 895 1554 2129 2570 2767 2787 2788 2788
Corn Growing Degree Days
50 M 141 173 263 394 556 707 821 779 674 502 271 153 5433
50 S 141 314 577 971 1527 2234 3055 3834 4508 5009 5281 5433 5433
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