TUCSON MAGNETIC OBSY, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(028800) TUCSON MAGNETIC OBSY
From Year=1912 To Year=1994
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 303 351 512 709 983 1242 1423 1364 1190 899 516 331 9825
40 S 303 654 1166 1876 2859 4101 5525 6888 8079 8978 9494 9825 9825
45 M 171 222 361 560 828 1092 1268 1209 1040 744 369 194 8059
45 S 171 393 754 1313 2142 3234 4502 5711 6751 7495 7865 8059 8059
50 M 71 116 222 412 673 942 1113 1054 890 590 235 88 6406
50 S 71 188 409 821 1494 2437 3550 4604 5494 6084 6318 6406 6406
55 M 19 44 111 272 519 792 958 899 740 438 122 26 4940
55 S 19 63 174 446 965 1757 2715 3614 4354 4792 4914 4940 4940
60 M 2 10 38 151 368 642 803 744 590 292 45 5 3691
60 S 2 12 51 202 570 1212 2015 2759 3349 3641 3686 3691 3691
Corn Growing Degree Days
50 M 233 260 358 472 603 729 888 866 747 576 365 253 6350
50 S 233 493 851 1323 1926 2655 3543 4409 5156 5732 6097 6350 6350
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