FT DEFIANCE, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(023102) FORT DEFIANCE
From Year=1897 To Year=1949
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 1 11 44 195 403 680 877 849 588 272 37 2 3957
40 S 1 11 56 251 654 1333 2210 3058 3646 3918 3955 3957 3957
45 M 0 1 10 90 259 530 722 694 439 144 6 0 2894
45 S 0 1 10 101 360 889 1611 2305 2744 2888 2894 2894 2894
50 M 0 0 1 29 135 381 567 539 295 57 0 0 2003
50 S 0 0 1 30 165 546 1113 1651 1947 2003 2003 2003 2003
55 M 0 0 0 5 47 239 412 384 166 16 0 0 1268
55 S 0 0 0 5 52 291 703 1086 1252 1268 1268 1268 1268
60 M 0 0 0 1 11 119 258 229 65 3 0 0 685
60 S 0 0 0 1 11 130 388 617 682 685 685 685 685
Corn Growing Degree Days
50 M 7 24 77 201 321 469 564 543 390 240 89 17 2942
50 S 7 31 107 309 629 1098 1662 2205 2596 2836 2925 2942 2942
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