GLEN LYN, VIRGINIA

Period of Record General Climate Summary - Growing Degree Days

From Year=1914 To Year=2006
Station:(443397) GLEN LYN
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 74 83 214 471 761 945 1067 1037 818 528 211 72 6281
40 S 74 158 372 843 1603 2548 3615 4652 5470 5998 6209 6281 6281
45 M 33 37 124 331 606 795 912 882 668 378 118 31 4914
45 S 33 71 194 525 1131 1926 2838 3719 4387 4765 4883 4914 4914
50 M 12 13 61 209 453 645 757 727 518 242 57 12 3706
50 S 12 25 86 296 749 1394 2151 2877 3396 3637 3695 3706 3706
55 M 3 3 24 116 307 495 602 572 372 131 22 3 2650
55 S 3 5 30 146 453 948 1550 2122 2494 2625 2647 2650 2650
60 M 0 0 7 51 179 347 447 417 236 54 6 0 1747
60 S 0 0 7 58 237 585 1032 1449 1685 1740 1746 1747 1747
Corn Growing Degree Days
50 M 51 60 150 303 489 622 718 700 531 340 145 48 4156
50 S 51 111 261 564 1053 1675 2393 3093 3624 3964 4109 4156 4156
Derived form the 1914-2006 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