MANASSAS, VIRGINIA

Period of Record General Climate Summary - Growing Degree Days

From Year=1895 To Year=1985
Station:(445213) MANASSAS
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 43 56 196 443 759 972 1139 1093 864 525 229 69 6388
40 S 43 99 295 738 1497 2468 3608 4700 5565 6090 6319 6388 6388
45 M 17 23 105 306 604 822 984 938 714 376 130 30 5050
45 S 17 40 146 452 1056 1877 2861 3799 4514 4889 5020 5050 5050
50 M 5 8 49 189 451 672 829 783 564 240 64 10 3865
50 S 5 14 63 252 703 1374 2204 2986 3551 3791 3855 3865 3865
55 M 1 2 19 101 306 522 674 628 417 131 25 3 2829
55 S 1 3 22 123 429 951 1625 2253 2670 2801 2826 2829 2829
60 M 0 0 5 47 179 373 519 473 279 61 8 0 1945
60 S 0 0 6 53 232 605 1124 1597 1876 1937 1944 1945 1945
Corn Growing Degree Days
50 M 30 38 130 274 478 644 776 742 562 324 141 44 4183
50 S 30 68 198 472 950 1594 2370 3112 3674 3998 4139 4183 4183
Derived form the 1895-1985 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