ROCKY KNOB, VIRGINIA

Period of Record General Climate Summary - Growing Degree Days

From Year=1940 To Year=1975
Station:(447330) ROCKY KNOB
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 61 53 175 385 646 818 933 897 720 442 197 72 5400
40 S 61 114 289 675 1321 2139 3071 3969 4689 5131 5328 5400 5400
45 M 25 19 98 259 492 668 778 742 571 297 109 32 4092
45 S 25 45 143 403 895 1563 2341 3083 3654 3951 4060 4092 4092
50 M 8 6 48 156 346 518 623 587 424 171 50 10 2947
50 S 8 14 62 218 564 1082 1705 2292 2716 2887 2937 2947 2947
55 M 2 1 20 80 213 371 468 432 285 76 16 1 1965
55 S 2 3 23 103 316 687 1155 1587 1872 1948 1964 1965 1965
60 M 0 0 5 32 107 230 314 280 162 22 3 0 1155
60 S 0 0 5 37 144 374 688 968 1130 1152 1155 1155 1155
Corn Growing Degree Days
50 M 28 26 101 217 380 523 622 588 438 227 97 31 3279
50 S 28 54 155 373 753 1276 1898 2486 2924 3152 3248 3279 3279
Derived form the 1940-1975 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