WILLIAMSPORT, MARYLAND

Period of Record General Climate Summary - Growing Degree Days

From Year=1938 To Year=2012
Station:(189570) WILLIAMSPORT
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 36 29 149 372 607 927 1096 1047 843 480 200 45 5830
40 S 36 65 214 586 1192 2119 3215 4262 5105 5586 5785 5830 5830
45 M 12 10 78 238 452 777 941 892 693 336 102 16 4549
45 S 12 22 100 339 791 1567 2508 3400 4094 4430 4532 4549 4549
50 M 4 3 36 134 303 627 786 737 543 208 44 5 3431
50 S 4 7 43 178 481 1108 1893 2631 3174 3382 3426 3431 3431
55 M 1 0 14 64 176 477 631 582 393 106 16 1 2462
55 S 1 1 15 79 255 732 1363 1945 2338 2445 2461 2462 2462
60 M 0 0 4 26 81 331 476 427 252 41 2 0 1641
60 S 0 0 4 29 111 442 918 1346 1597 1638 1641 1641 1641
Corn Growing Degree Days
50 M 28 26 103 233 363 611 739 705 541 278 124 32 3780
50 S 28 53 156 390 752 1363 2102 2807 3347 3625 3749 3780 3780
Derived form the 1938-2012 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