JOHN FLANNAGAN RESERVOI, VIRGINIA

Period of Record General Climate Summary - Heating Degree Days

From Year=1969 To Year=2012
Station:(444410) JOHN FLANNAGAN RESERVOI
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 1292 910 618 314 90 11 1 12 70 283 675 955 5230
60 1137 769 467 196 39 0 0 1 19 161 531 800 4120
57 1044 685 379 141 22 0 0 0 5 105 451 707 3540
55 982 629 324 112 14 0 0 0 1 75 401 645 3183
50 827 492 209 55 4 0 0 0 0 27 284 498 2396
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