VIENNA, MARYLAND

Period of Record General Climate Summary - Cooling Degree Days

From Year=1949 To Year=2010
Station:(189140) VIENNA
Averages Daily Extremes
Cooling Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
55 3 3 24 111 319 564 718 666 451 179 40 6 3085
57 2 1 15 83 264 504 656 604 392 139 26 3 2691
60 1 0 7 51 189 415 563 511 306 89 12 1 2146
65 0 0 2 18 92 271 408 357 178 34 2 0 1363
70 0 0 0 4 34 147 255 211 82 10 0 0 743
Cooling 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.
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