WINDOW ROCK 4 SW, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(029410) WINDOW ROCK 4 SW
From Year=1937 To Year=1999
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 3 13 61 203 444 714 917 853 611 311 56 5 4191
40 S 3 16 77 281 724 1438 2355 3208 3819 4130 4186 4191 4191
45 M 0 1 16 99 296 564 762 698 461 177 12 0 3088
45 S 0 2 18 117 413 976 1739 2437 2898 3076 3088 3088 3088
50 M 0 0 2 33 164 414 607 543 314 74 1 0 2153
50 S 0 0 2 35 199 614 1221 1764 2078 2152 2153 2153 2153
55 M 0 0 0 6 66 269 453 389 176 19 0 0 1378
55 S 0 0 0 6 72 341 794 1183 1359 1378 1378 1378 1378
60 M 0 0 0 1 16 142 299 235 68 2 0 0 762
60 S 0 0 0 1 17 158 458 692 760 762 762 762 762
Corn Growing Degree Days
50 M 13 32 84 195 335 483 589 546 410 262 90 25 3065
50 S 13 46 130 325 660 1143 1732 2278 2688 2951 3040 3065 3065
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