JOHN FLANNAGAN RESERVOI, VIRGINIA

Period of Record General Climate Summary - Growing Degree Days

From Year=1969 To Year=2012
Station:(444410) JOHN FLANNAGAN RESERVOI
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 8 46 225 461 769 940 1080 962 762 504 172 68 5998
40 S 8 54 279 740 1509 2449 3530 4492 5254 5758 5930 5998 5998
45 M 1 18 125 328 615 790 925 807 612 354 107 28 4711
45 S 1 19 144 472 1087 1877 2802 3610 4222 4576 4683 4711 4711
50 M 0 4 56 208 463 640 770 652 462 220 60 8 3544
50 S 0 4 60 268 731 1372 2142 2794 3256 3476 3536 3544 3544
55 M 0 0 17 115 318 490 615 497 313 113 26 0 2505
55 S 0 0 17 132 450 940 1555 2053 2366 2479 2505 2505 2505
60 M 0 0 4 49 188 340 460 343 181 44 6 0 1616
60 S 0 0 4 53 242 582 1042 1385 1567 1610 1616 1616 1616
Corn Growing Degree Days
50 M 6 47 188 317 504 599 709 641 476 314 125 44 3970
50 S 6 54 241 558 1062 1662 2371 3011 3487 3801 3926 3970 3970
Derived form the 1969-2012 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