| Rank | Precipitation | Month |
|---|---|---|
| 1 | 16.0 inches | July 2011 |
| 2 | 15.5 inches | September 1965 |
| 3 | 13.3 inches | September 2019 |
| 4 | 13.1 inches | September 1961 |
| 5 | 13.1 inches | September 1986 |
| 6 | 12.7 inches | July 2010 |
| 7 | 12.6 inches | June 2014 |
| 8 | 12.2 inches | July 1961 |
| 9 | 11.9 inches | September 1967 |
| 10 | 10.6 inches | November 1961 |
| 11 | 10.5 inches | June 1969 |
| 12 | 9.9 inches | August 1987 |
| 13 | 9.7 inches | August 2002 |
| 14 | 9.7 inches | August 1981 |
| 15 | 9.5 inches | June 1966 |
| 16 | 9.4 inches | May 1962 |
| 17 | 9.2 inches | September 1970 |
| 18 | 9.1 inches | August 1980 |
| 19 | 9.0 inches | June 1947 |
| 20 | 8.9 inches | July 1962 |
| 20 | 8.9 inches | September 2018 |