POTOMAC FILTER PLANT, MARYLAND

Period of Record General Climate Summary - Growing Degree Days

From Year=1962 To Year=2011
Station:(187272) POTOMAC FILTER PLANT
Averages Daily Extremes
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 65 -99 173 375 671 -99 1161 -99 -99 -99 -99 196 -99
40 S 65 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99
45 M 36 -99 83 238 516 -99 1005 -99 -99 -99 -99 99 -99
45 S 36 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99
50 M 20 -99 36 119 362 -99 851 -99 -99 -99 -99 43 -99
50 S 20 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99
55 M 7 -99 18 52 220 -99 696 -99 -99 -99 -99 12 -99
55 S 7 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99
60 M 0 -99 8 13 107 -99 541 -99 -99 -99 -99 1 -99
60 S 0 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99
Corn Growing Degree Days
50 M 35 -99 118 204 421 -99 796 -99 -99 -99 -99 81 -99
50 S 35 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99 -99
Derived form the 1962-2011 Data
M = Monthly Data
S - Running sum of monthly data.
Growing 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.
Corn Growing Degree Day units have the limitations that the maximum daily temperatures greater than 86 F are set to 86 F and minimums less than 50 F are set to 50 F.
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