ALPHARETTA 5 SSW, GEORGIA

Period of Record General Climate Summary - Heating Degree Days

From Year=1901 To Year=2011
Station:(090219) ALPHARETTA 5 SSW
Averages Daily Extremes
Heating Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
65 821 660 475 229 63 5 0 0 22 204 457 723 3659
60 666 520 333 130 21 1 0 0 5 103 318 570 2667
57 575 439 256 85 8 0 0 0 2 61 244 481 2153
55 515 387 211 61 4 0 0 0 1 41 199 424 1844
50 372 266 117 23 1 0 0 0 0 11 109 289 1189
Heating Degree Day units are computed as the difference between the base temperature and the daily average temperature. (Base Temp. - Daily Ave. Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is below the base temperature. Negative numbers are discarded. Example: If the days high temperature was 65 and the low temperature was 31, the base 50 heating degree day units is 50 - ((65 + 31) / 2) = 2. This is done for each day of the month and summed.
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