| Rank | Precipitation | Month |
|---|---|---|
| 1 | 13.3 inches | June 2015 |
| 2 | 11.8 inches | July 2003 |
| 3 | 11.6 inches | July 1992 |
| 4 | 10.8 inches | June 1896 |
| 5 | 9.9 inches | June 1989 |
| 6 | 9.8 inches | March 1913 |
| 7 | 9.8 inches | November 1985 |
| 8 | 9.7 inches | September 1924 |
| 9 | 9.5 inches | October 1954 |
| 10 | 9.4 inches | August 2021 |
| 11 | 8.9 inches | July 1958 |
| 12 | 8.8 inches | September 1972 |
| 13 | 8.7 inches | January 2005 |
| 14 | 8.5 inches | January 1937 |
| 15 | 8.3 inches | July 1986 |
| 16 | 8.2 inches | June 1986 |
| 17 | 8.2 inches | May 2011 |
| 18 | 8.2 inches | July 1897 |
| 19 | 8.2 inches | September 1926 |
| 20 | 8.1 inches | July 1902 |