PORTAL 4 SW, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(026716) PORTAL 4 SW
From Year=1965 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 54 96 221 389 625 848 967 903 724 473 184 59 5542
40 S 54 150 371 760 1385 2233 3200 4102 4826 5299 5483 5542 5542
45 M 12 29 105 246 470 698 812 748 574 322 79 15 4109
45 S 12 41 146 392 862 1560 2372 3119 3693 4015 4094 4109 4109
50 M 1 5 31 123 317 548 657 593 424 182 21 1 2903
50 S 1 7 38 160 477 1026 1682 2275 2699 2880 2901 2903 2903
55 M 0 1 4 39 173 398 502 438 275 73 2 0 1905
55 S 0 1 5 44 217 615 1117 1555 1830 1902 1905 1905 1905
60 M 0 0 0 7 64 250 347 283 134 16 0 0 1101
60 S 0 0 0 7 71 321 668 951 1085 1101 1101 1101 1101
Corn Growing Degree Days
50 M 87 127 223 326 457 548 621 586 467 349 182 81 4054
50 S 87 214 436 762 1219 1767 2388 2974 3441 3790 3973 4054 4054
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