| Rank | Precipitation | Month |
|---|---|---|
| 1 | 6.3 inches | August 1909 |
| 2 | 5.1 inches | September 1997 |
| 3 | 5.1 inches | September 1939 |
| 4 | 4.4 inches | December 1926 |
| 5 | 3.7 inches | September 1921 |
| 6 | 3.4 inches | August 1989 |
| 7 | 3.4 inches | February 1905 |
| 8 | 3.4 inches | October 1932 |
| 9 | 3.3 inches | March 1905 |
| 10 | 3.0 inches | February 1901 |
| 11 | 3.0 inches | August 1977 |
| 12 | 2.8 inches | January 1949 |
| 13 | 2.8 inches | January 1897 |
| 14 | 2.8 inches | December 1997 |
| 15 | 2.7 inches | March 2020 |
| 16 | 2.7 inches | October 1957 |
| 17 | 2.6 inches | August 1983 |
| 18 | 2.6 inches | December 1908 |
| 19 | 2.6 inches | January 1915 |
| 20 | 2.6 inches | July 1989 |