BACK BAY WILDLIFE REFUG, VIRGINIA

Period of Record General Climate Summary - Growing Degree Days

From Year=1953 To Year=2012
Station:(440385) BACK BAY WILDLIFE REFUG
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 115 129 295 531 799 1025 1189 1166 989 733 428 197 7596
40 S 115 244 539 1070 1869 2895 4084 5249 6238 6971 7399 7596 7596
45 M 53 64 175 385 644 875 1034 1011 839 578 288 104 6051
45 S 53 117 292 677 1321 2196 3230 4241 5079 5658 5946 6051 6051
50 M 20 26 92 251 489 725 879 856 689 426 169 46 4668
50 S 20 46 138 388 878 1603 2482 3338 4027 4452 4622 4668 4668
55 M 5 8 39 143 339 575 724 701 539 280 81 14 3447
55 S 5 12 52 195 534 1109 1833 2534 3072 3352 3433 3447 3447
60 M 0 2 13 69 202 426 569 546 389 154 29 2 2401
60 S 0 2 15 84 286 712 1281 1827 2216 2370 2398 2401 2401
Corn Growing Degree Days
50 M 56 66 149 290 493 707 843 830 682 440 214 87 4858
50 S 56 122 271 561 1054 1761 2604 3434 4117 4557 4771 4858 4858
Derived form the 1953-2012 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