UNIONVILLE, MARYLAND

Period of Record General Climate Summary - Heating Degree Days

From Year=1940 To Year=1996
Station:(189030) UNIONVILLE
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 1074 916 738 415 165 27 2 11 93 349 645 976 5411
60 919 775 586 283 80 5 0 1 37 218 498 821 4224
57 826 691 497 213 45 2 0 0 19 153 413 729 3587
55 764 635 439 170 29 1 0 0 11 117 358 667 3191
50 612 496 303 84 6 0 0 0 2 48 233 516 2301
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