ALPHARETTA 5 SSW, GEORGIA

Period of Record General Climate Summary - Growing Degree Days

From Year=1901 To Year=2011
Station:(090219) ALPHARETTA 5 SSW
Averages Daily Extremes
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 97 134 325 546 811 1002 1132 1117 910 596 313 140 7122
40 S 97 231 556 1101 1913 2914 4047 5163 6073 6669 6982 7122 7122
45 M 44 69 204 400 656 852 977 962 760 443 196 72 5634
45 S 44 113 316 716 1373 2224 3202 4163 4923 5366 5562 5634 5634
50 M 16 29 110 267 502 702 822 807 610 297 105 32 4301
50 S 16 46 156 424 926 1627 2450 3256 3867 4163 4269 4301 4301
55 M 5 9 49 156 351 552 667 652 461 172 45 12 3130
55 S 5 14 63 219 570 1122 1789 2441 2901 3073 3118 3130 3130
60 M 1 1 16 74 212 402 512 497 315 79 14 3 2126
60 S 1 2 18 92 305 707 1219 1716 2031 2110 2124 2126 2126
Corn Growing Degree Days
50 M 62 94 213 349 523 679 780 768 605 372 202 90 4736
50 S 62 156 369 718 1241 1920 2700 3468 4073 4445 4647 4736 4736
Derived form the 1901-2011 Data
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 May 22,
Months with 5 or more missing days are not considered
Years with 1 or more missing months are not considered

Southeast Regional Climate Center, SERCC Webmaster