| Rank | Precipitation | Month |
|---|---|---|
| 1 | 12.4 inches | July 1992 |
| 2 | 11.5 inches | August 2003 |
| 3 | 10.7 inches | November 1985 |
| 4 | 10.6 inches | January 1937 |
| 5 | 10.4 inches | June 2008 |
| 6 | 9.8 inches | June 1958 |
| 7 | 9.6 inches | March 1964 |
| 8 | 9.5 inches | May 1933 |
| 9 | 9.5 inches | July 1958 |
| 10 | 9.2 inches | June 1902 |
| 11 | 9.1 inches | May 1968 |
| 12 | 9.0 inches | March 1913 |
| 13 | 9.0 inches | January 2005 |
| 14 | 8.8 inches | June 1973 |
| 15 | 8.7 inches | May 2022 |
| 16 | 8.6 inches | August 1979 |
| 17 | 8.6 inches | July 2017 |
| 18 | 8.4 inches | March 1945 |
| 19 | 8.3 inches | July 1943 |
| 20 | 8.3 inches | January 1950 |