WASHINGTON DC 3 SSW, VIRGINIA

Period of Record General Climate Summary - Growing Degree Days

From Year=1944 To Year=1995
Station:(448902) WASHINGTON DC 3 SSW
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 21 34 137 393 662 876 1036 1003 770 446 178 41 5600
40 S 21 56 193 586 1249 2125 3160 4164 4934 5380 5558 5600 5600
45 M 7 13 68 263 508 726 881 848 620 303 97 14 4347
45 S 7 20 88 350 858 1584 2464 3313 3933 4236 4333 4347 4347
50 M 2 3 28 159 358 576 726 693 471 179 45 3 3243
50 S 2 5 33 192 550 1126 1851 2545 3016 3195 3240 3243 3243
55 M 0 0 9 86 223 427 571 538 327 87 19 1 2289
55 S 0 1 10 96 319 746 1316 1855 2182 2269 2288 2289 2289
60 M 0 0 2 39 117 283 416 384 198 30 6 0 1473
60 S 0 0 2 41 158 441 856 1240 1437 1467 1473 1473 1473
Corn Growing Degree Days
50 M 23 35 108 254 417 569 690 668 492 293 129 41 3719
50 S 23 58 166 420 837 1406 2096 2764 3256 3549 3678 3719 3719
Derived form the 1944-1995 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