| Rank | Precipitation | Month |
|---|---|---|
| 1 | 17.9 inches | July 1993 |
| 2 | 17.3 inches | May 1903 |
| 3 | 16.0 inches | May 2007 |
| 4 | 15.6 inches | May 1995 |
| 5 | 13.8 inches | August 1977 |
| 6 | 13.6 inches | June 1905 |
| 7 | 12.5 inches | June 1951 |
| 8 | 12.4 inches | June 1927 |
| 9 | 12.1 inches | September 1967 |
| 10 | 10.8 inches | March 1973 |
| 11 | 10.7 inches | July 1951 |
| 12 | 10.0 inches | June 1981 |
| 13 | 9.9 inches | June 1942 |
| 14 | 9.8 inches | July 1992 |
| 15 | 9.4 inches | September 1942 |
| 16 | 9.4 inches | July 1915 |
| 17 | 9.0 inches | July 1971 |
| 18 | 8.9 inches | July 1904 |
| 19 | 8.9 inches | August 2019 |
| 20 | 8.8 inches | July 1963 |