VIENNA, MARYLAND

Period of Record General Climate Summary - Growing Degree Days

From Year=1949 To Year=2010
Station:(189140) VIENNA
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 73 79 224 475 778 1014 1183 1131 900 600 298 112 6867
40 S 73 152 376 850 1629 2643 3826 4957 5857 6457 6754 6867 6867
45 M 32 33 124 332 623 864 1028 976 750 447 182 53 5444
45 S 32 66 189 521 1144 2008 3036 4013 4762 5210 5391 5444 5444
50 M 11 11 60 206 469 714 873 821 600 302 96 20 4183
50 S 11 22 82 288 757 1471 2344 3165 3765 4067 4163 4183 4183
55 M 3 3 24 111 319 564 718 666 451 179 40 6 3085
55 S 3 6 30 142 461 1025 1743 2409 2860 3039 3079 3085 3085
60 M 1 0 7 51 189 415 563 511 306 89 12 1 2146
60 S 1 1 8 59 248 663 1226 1738 2044 2133 2145 2146 2146
Corn Growing Degree Days
50 M 40 45 131 281 488 686 817 781 598 365 166 58 4456
50 S 40 85 216 496 984 1670 2486 3268 3866 4231 4398 4456 4456
Derived form the 1949-2010 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