| Rank | Precipitation | Month |
|---|---|---|
| 1 | 16.9 inches | July 1958 |
| 2 | 16.2 inches | May 1935 |
| 3 | 13.9 inches | September 1961 |
| 4 | 13.5 inches | August 1895 |
| 5 | 12.8 inches | June 1967 |
| 6 | 11.8 inches | June 1908 |
| 7 | 11.7 inches | May 1904 |
| 8 | 11.7 inches | June 1951 |
| 9 | 11.7 inches | August 2016 |
| 10 | 11.5 inches | July 1951 |
| 11 | 11.4 inches | October 1941 |
| 12 | 11.2 inches | June 1965 |
| 13 | 11.2 inches | October 2018 |
| 14 | 10.9 inches | June 1969 |
| 15 | 10.9 inches | June 2005 |
| 16 | 10.7 inches | April 1944 |
| 17 | 10.6 inches | May 2015 |
| 18 | 10.6 inches | May 2019 |
| 19 | 10.1 inches | September 1914 |
| 20 | 10.0 inches | June 1947 |