| Rank | Precipitation | Month |
|---|---|---|
| 1 | 22.7 inches | June 2022 |
| 2 | 21.3 inches | October 2011 |
| 3 | 19.8 inches | September 1997 |
| 4 | 18.9 inches | June 1968 |
| 5 | 18.5 inches | July 2013 |
| 6 | 18.3 inches | September 2010 |
| 7 | 18.0 inches | June 2009 |
| 8 | 18.0 inches | October 1952 |
| 9 | 17.5 inches | May 1984 |
| 10 | 17.1 inches | September 1981 |
| 11 | 17.0 inches | August 2017 |
| 12 | 15.1 inches | October 1947 |
| 13 | 15.0 inches | June 2023 |
| 14 | 15.0 inches | May 2020 |
| 15 | 14.9 inches | June 1930 |
| 16 | 14.6 inches | June 1959 |
| 17 | 14.4 inches | June 1983 |
| 18 | 14.3 inches | October 1950 |
| 19 | 14.2 inches | June 1995 |
| 20 | 14.1 inches | June 1969 |