SAN JUAN WSFO, PUERTO RICO

Period of Record General Climate Summary - Growing Degree Days

From Year=1956 To Year=2012
Station:(668812) SAN JUAN WSFO
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 1144 1049 1180 1182 1268 1270 1320 1327 1278 1299 1197 1179 14693
40 S 1144 2192 3372 4554 5823 7093 8413 9740 11017 12316 13514 14693 14693
45 M 989 907 1025 1032 1113 1120 1165 1172 1128 1144 1047 1024 12867
45 S 989 1896 2921 3953 5066 6187 7351 8523 9651 10795 11842 12867 12867
50 M 834 766 870 882 958 970 1010 1017 978 989 897 869 11041
50 S 834 1600 2470 3352 4310 5280 6290 7307 8285 9274 10171 11041 11041
55 M 679 625 715 732 803 820 855 862 828 834 747 714 9214
55 S 679 1303 2018 2750 3554 4374 5229 6091 6918 7752 8500 9214 9214
60 M 524 483 560 582 648 670 700 707 678 679 597 559 7388
60 S 524 1007 1567 2149 2797 3468 4167 4874 5552 6231 6828 7388 7388
Corn Growing Degree Days
50 M 832 762 861 866 930 930 969 971 932 950 885 866 10756
50 S 832 1593 2454 3321 4251 5180 6150 7121 8054 9004 9889 10756 10756
Derived form the 1956-2012 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