JOHN H KERR DAM, VIRGINIA

Period of Record General Climate Summary - Growing Degree Days

From Year=1948 To Year=2012
Station:(444414) JOHN H KERR DAM
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 94 108 278 536 821 1035 1195 1153 913 588 310 128 7160
40 S 94 202 479 1016 1836 2872 4067 5220 6134 6722 7032 7160 7160
45 M 45 52 169 392 666 885 1040 998 763 436 194 65 5707
45 S 45 98 266 658 1324 2210 3250 4248 5011 5448 5642 5707 5707
50 M 19 21 91 261 512 735 885 843 613 295 107 29 4412
50 S 19 40 131 392 903 1638 2524 3367 3980 4276 4383 4412 4412
55 M 7 6 42 156 363 586 730 688 464 176 50 11 3280
55 S 7 13 55 212 574 1160 1890 2578 3043 3219 3269 3280 3280
60 M 2 1 16 82 229 437 575 534 322 88 18 3 2307
60 S 2 3 19 101 330 767 1342 1876 2197 2286 2304 2307 2307
Corn Growing Degree Days
50 M 63 76 179 334 526 698 817 788 605 371 199 82 4739
50 S 63 139 318 652 1179 1877 2694 3482 4087 4458 4657 4739 4739
Derived form the 1948-2012 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