WILLIAMS, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(029359) WILLIAMS
From Year=1897 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 19 29 79 217 448 704 882 823 630 351 106 25 4312
40 S 19 47 126 343 791 1495 2377 3200 3830 4181 4287 4312 4312
45 M 3 5 24 110 303 554 727 668 481 216 40 4 3135
45 S 3 8 33 143 445 999 1726 2394 2875 3091 3130 3135 3135
50 M 0 1 4 40 173 406 572 513 334 104 9 0 2156
50 S 0 1 5 45 218 624 1196 1709 2043 2147 2156 2156 2156
55 M 0 0 0 9 74 264 417 358 194 34 1 0 1351
55 S 0 0 0 9 83 347 764 1122 1316 1350 1351 1351 1351
60 M 0 0 0 1 20 140 263 206 79 5 0 0 714
60 S 0 0 0 1 21 161 424 629 708 714 714 714 714
Corn Growing Degree Days
50 M 24 34 79 176 315 470 568 523 404 257 107 38 2995
50 S 24 58 137 314 629 1099 1666 2190 2593 2850 2957 2995 2995
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