MANASSAS, VIRGINIA

Period of Record General Climate Summary - Heating Degree Days

From Year=1895 To Year=1985
Station:(445213) MANASSAS
Averages Daily Extremes
Heating Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
65 965 837 631 327 102 11 1 2 46 272 557 876 4626
60 810 696 481 207 40 2 0 0 14 157 413 721 3540
57 717 612 394 145 20 0 0 0 6 102 331 629 2957
55 656 557 339 111 12 0 0 0 3 72 280 569 2598
50 505 422 214 49 2 0 0 0 0 26 169 421 1808
Heating Degree Day units are computed as the difference between the base temperature and the daily average temperature. (Base Temp. - Daily Ave. Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is below the base temperature. Negative numbers are discarded. Example: If the days high temperature was 65 and the low temperature was 31, the base 50 heating degree day units is 50 - ((65 + 31) / 2) = 2. This is done for each day of the month and summed.
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