ALAMO DAM, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(020100) ALAMO DAM
From Year=1975 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 341 423 640 849 1165 1412 1634 1586 1338 1006 581 329 11303
40 S 341 764 1404 2252 3417 4829 6463 8049 9387 10393 10974 11303 11303
45 M 195 285 485 699 1010 1262 1479 1431 1188 851 431 185 9500
45 S 195 480 965 1663 2673 3935 5414 6845 8033 8884 9315 9500 9500
50 M 79 157 333 549 855 1112 1324 1276 1038 696 288 73 7779
50 S 79 236 568 1117 1972 3084 4408 5683 6721 7417 7706 7779 7779
55 M 17 62 194 402 700 962 1169 1121 888 542 164 16 6236
55 S 17 80 274 676 1376 2338 3506 4627 5515 6057 6220 6236 6236
60 M 2 14 89 264 545 812 1014 966 738 389 70 1 4905
60 S 2 16 105 369 914 1726 2740 3706 4444 4833 4903 4905 4905
Corn Growing Degree Days
50 M 248 286 407 525 709 827 980 960 811 618 384 240 6994
50 S 248 533 940 1465 2174 3001 3981 4941 5752 6369 6754 6994 6994
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