| Rank | Precipitation | Month |
|---|---|---|
| 1 | 10.1 inches | June 1965 |
| 2 | 8.1 inches | August 1897 |
| 3 | 7.9 inches | April 1900 |
| 4 | 7.5 inches | May 1969 |
| 5 | 7.3 inches | May 1973 |
| 6 | 7.1 inches | March 2003 |
| 7 | 7.1 inches | May 2023 |
| 8 | 6.6 inches | April 1999 |
| 9 | 6.5 inches | May 1898 |
| 10 | 6.5 inches | September 2013 |
| 11 | 5.9 inches | May 1904 |
| 12 | 5.9 inches | July 2014 |
| 13 | 5.6 inches | May 2017 |
| 14 | 5.5 inches | August 1997 |
| 15 | 5.4 inches | May 1987 |
| 16 | 5.4 inches | October 1923 |
| 17 | 5.4 inches | December 1913 |
| 18 | 5.2 inches | May 2015 |
| 19 | 5.2 inches | June 2015 |
| 20 | 5.1 inches | May 1995 |