SAN JUAN CITY, PUERTO RICO

Period of Record General Climate Summary - Growing Degree Days

From Year=1955 To Year=1977
Station:(668808) SAN JUAN CITY
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 1115 1015 1140 1132 1215 1211 1248 1262 1232 1259 1168 1146 14143
40 S 1115 2129 3269 4401 5616 6827 8075 9337 10570 11829 12997 14143 14143
45 M 960 873 985 982 1060 1061 1093 1107 1082 1104 1018 991 12317
45 S 960 1833 2817 3799 4860 5920 7014 8121 9203 10307 11325 12317 12317
50 M 805 732 830 832 905 911 938 952 932 949 868 836 10490
50 S 805 1536 2366 3198 4103 5014 5952 6904 7837 8786 9654 10490 10490
55 M 650 590 675 682 750 761 783 797 782 794 718 681 8664
55 S 650 1240 1914 2596 3347 4107 4891 5688 6470 7264 7982 8664 8664
60 M 495 449 520 532 595 611 628 642 632 639 568 526 6837
60 S 495 943 1463 1995 2590 3201 3829 4471 5104 5743 6311 6837 6837
Corn Growing Degree Days
50 M 803 730 825 826 896 899 934 942 918 934 864 835 10407
50 S 803 1533 2358 3184 4080 4978 5913 6855 7773 8707 9571 10407 10407
Derived form the 1955-1977 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