AJO, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(020080) AJO
From Year=1914 To Year=2006
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 399 484 664 863 1136 1372 1561 1501 1337 1061 662 456 11495
40 S 399 883 1547 2409 3546 4917 6479 7979 9316 10377 11039 11495 11495
45 M 255 346 509 713 981 1222 1406 1346 1187 906 513 308 9691
45 S 255 601 1110 1823 2804 4026 5432 6778 7964 8870 9383 9691 9691
50 M 133 218 358 563 826 1072 1251 1191 1037 751 367 176 7942
50 S 133 351 709 1272 2098 3170 4421 5612 6648 7400 7767 7942 7942
55 M 50 114 222 415 672 922 1096 1036 887 597 234 77 6321
55 S 50 164 386 801 1473 2395 3491 4527 5413 6010 6244 6321 6321
60 M 12 45 114 278 518 772 941 881 737 446 125 23 4892
60 S 12 57 171 449 967 1739 2680 3561 4297 4743 4869 4892 4892
Corn Growing Degree Days
50 M 223 279 397 548 734 866 987 962 865 692 402 255 7211
50 S 223 502 900 1448 2181 3048 4035 4997 5862 6553 6955 7211 7211
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 Jul 28, 2006
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