| Rank | Precipitation | Month |
|---|---|---|
| 1 | 12.6 inches | July 2003 |
| 2 | 11.4 inches | July 1958 |
| 3 | 10.9 inches | July 1992 |
| 4 | 10.0 inches | July 1990 |
| 5 | 9.6 inches | May 1956 |
| 6 | 9.4 inches | November 1985 |
| 7 | 9.3 inches | June 2014 |
| 8 | 9.0 inches | September 1990 |
| 9 | 9.0 inches | July 1976 |
| 10 | 8.8 inches | March 1964 |
| 11 | 8.7 inches | January 1950 |
| 12 | 8.4 inches | October 1954 |
| 12 | 8.4 inches | June 1989 |
| 14 | 8.3 inches | June 2015 |
| 15 | 8.3 inches | June 2019 |
| 16 | 8.2 inches | August 1974 |
| 17 | 8.2 inches | May 2003 |
| 18 | 7.9 inches | September 1979 |
| 19 | 7.8 inches | June 2008 |
| 20 | 7.5 inches | August 1994 |