| Rank | Precipitation | Month |
|---|---|---|
| 1 | 9.3 inches | May 1943 |
| 2 | 9.2 inches | July 2006 |
| 3 | 8.5 inches | October 1881 |
| 4 | 8.5 inches | June 1981 |
| 5 | 8.5 inches | August 1965 |
| 6 | 8.3 inches | August 2007 |
| 7 | 8.1 inches | September 1972 |
| 8 | 8.1 inches | September 1926 |
| 9 | 8.0 inches | March 1913 |
| 10 | 7.9 inches | June 1911 |
| 11 | 7.8 inches | September 1918 |
| 12 | 7.6 inches | August 1926 |
| 13 | 7.6 inches | August 1908 |
| 14 | 7.4 inches | October 2021 |
| 15 | 7.4 inches | May 1892 |
| 16 | 7.4 inches | May 1913 |
| 17 | 7.4 inches | June 1881 |
| 18 | 7.2 inches | June 2015 |
| 19 | 7.2 inches | November 2011 |
| 20 | 7.1 inches | April 1929 |