Monthly Extremes for Primary Climatological Data Sites
Wettest -Highest total precipitation for the calendar month/ Driest- Lowest total precipitation for the calendar month
Hottest - Highest average temperatures for the calendar month/ Coolest - Lowest average temperature for the calendar month
Allowable missing days: less than 10% for temperature and "Wettest" column; zero for "Driest" column.
San Juan Area (climate records since 1898)
| Wettest | Driest | Hottest | Coolest | |
| 1 | 18.56" Aug 2011 | Trace Mar 2005 | 86.1°F Sep 2024 | 73.3°F Feb 1951 |
| 2 | 17.65" Nov 2016 | 0.05" Feb 1941 | 86.1°F Jun 2024 | 73.3°F Jan 1950 |
| 3 | 16.88" May 1936 | 0.08" Apr 1997 | 85.8°F Aug 2024 | 73.3°F Feb 1917 |
| 4 | 16.81" Dec 1981 | 0.09" Feb 1902 | 85.8°F Sep 2023 | 73.4°F Feb 1925 |
| 5 | 15.96" Nov 1979 | 0.16" Jun 2012 | 85.7°F Jul 2024 | 73.4°F Jan 1917 |
| 6 | 15.79" Sep 2017 | 0.20" Feb 1983 | 85.7°F Jun 2012 | 73.4°F Feb 1907 |
| 7 | 15.64" Nov 1931 | 0.28" Apr 1984 | 85.6°F Oct 2024 | 73.4°F Jan 1907 |
| 8 | 15.47" Jan 1937 | 0.29" Jun 1985 | 85.6°F Jun 2023 | 73.6 °F Feb 1950 |
| 9 | 15.40" Dec 1910 | 0.42" Apr 1935 | 85.4°F Oct 2023 | 73.6°F Feb 1949 |
| 10 | 15.15" Sep 1996 | 0.44" May 1972 | 85.4°F Jun 1983 | 73.6°F Jan 1945 |
Saint Thomas/Cyril E. King Airport (climate records since 1953)
| Wettest | Driest | Hottest | Coolest | |
| 1 | 18.39" Nov 2003 | 0.01" Mar 2008 | 87.3°F Aug 1994 | 74.5°F Mar 2018 |
| 2 | 16.20" Oct 2010 | 0.03" Jul 2007 | 87.2°F Aug 1993 | 75.0°F Jan 1955 |
| 3 | 14.94" Sep 1953 | 0.06" May 2008 | 86.6°F Jul 1979 | 75.7 °F Dec 2010 |
| 4 | 14.73" Nov 1984 | 0.07" Jun 2007 | 86.5°F Jul 1994 | 75.8°F Feb 1956 |
| 5 | 13.89" Sep 2004 | 0.08" Jun 2012 | 86.4°F Jun 1994 | 76.0°F Jan 1956 |
| 6 | 13.35" Feb 2015 | 0.14" Jun 2014 | 86.4°F June 1979 | 76.1" Dec 1964† |
| 7 | 12.86" Sep 2008 | 0.18" Jun 2003 | 86.3°F Sep 1993 | 76.2°F Feb 1999 |
| 8 | 12.49" Oct 2005 | 0.22" Jul 2015 | 86.2°F Jul 1993 | 76.2°F Feb 1955 |
| 9 | 12.45" Oct 1974 | 0.23" Apr 1953 | 86.2°F Jun 1996 | 76.2°F Dec 1954 |
| 10 | 12.39" Oct 1954 | 0.24" Jul 1956 | 86.0°F Sep 2023 | 76.2°F Feb 1954 |
Saint Croix/Henry E. Rohlsen Airport (climate records since 1951)
| Wettest | Driest | Hottest | Coolest | |
| 1 | 19.15" Sep 1996 | Trace Apr 1988 | 87.7°F Sep 2023 | 73.4°F Jan 2012 |
| 2 | 18.03" Nov 2003 | 0.02" Mar 2019 | 86.7°F Aug 2023 | 74.8°F Feb 2012 |
| 3 | 16.34" Nov 1974 | 0.02" Apr 1997 | 86.5°F Aug 1989 | 75.2°F Jan 1979 |
| 4 | 16.20" Oct 1977 | 0.10" Jun 2001 | 86.5°F Jul 1989 | 75.5°F Jan 1955 |
| 5 | 14.03" May 1981 | 0.11" Feb 2005 | 85.9°F Aug 2020 | 75.7°F Apr 1982 |
| 6 | 14.03" Dec 1960 | 0.12" Jun 1985 | 85.6°F Jul 2024 | 75.7°F Jan 1965 |
| 7 | 13.25" Nov 1987 | 0.17" Mar 1951 | 85.6°F Oct 2023 | 75.8°F Mar 1951 |
| 8 | 12.95" Oct 1990 | 0.22" May 1974 | 85.6°F Jun 2020 | 75.8°F Dec 1964 |
| 9 | 12.70" Nov 1984 | 0.22" Apr 1953 | 85.6°F Jun 1980 | 75.9°F Dec 2010 |
| 10 | 11.79" Oct 1954 | 0.26" Jun 2012 | 85.3°F Sep 1993 | 75.9°F Mar 1982 |
Click here to return to unique local climate data web page for the NWS San Juan
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