VIENNA, MARYLAND

Period of Record General Climate Summary - Heating Degree Days

From Year=1949 To Year=2010
Station:(189140) VIENNA
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
65 883 754 587 294 89 7 0 1 29 210 469 772 4094
60 728 613 438 177 31 1 0 0 6 109 329 618 3051
57 637 529 353 119 13 0 0 0 2 66 253 527 2500
55 576 474 300 88 6 0 0 0 1 44 207 468 2164
50 429 341 181 32 0 0 0 0 0 12 113 327 1436
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