| Rank | Precipitation | Month |
|---|---|---|
| 1 | 16.6 inches | June 2015 |
| 2 | 11.2 inches | July 1915 |
| 3 | 11.1 inches | August 2007 |
| 4 | 10.1 inches | July 2017 |
| 5 | 10.1 inches | July 1992 |
| 6 | 10.0 inches | March 1913 |
| 7 | 9.8 inches | September 1926 |
| 8 | 9.4 inches | April 1957 |
| 9 | 9.2 inches | May 2017 |
| 10 | 9.2 inches | June 1946 |
| 11 | 9.2 inches | July 2013 |
| 12 | 9.2 inches | May 1943 |
| 13 | 8.8 inches | June 1939 |
| 14 | 8.6 inches | April 1964 |
| 15 | 8.5 inches | April 2019 |
| 16 | 8.4 inches | May 2019 |
| 17 | 8.3 inches | January 1950 |
| 18 | 8.3 inches | September 1933 |
| 19 | 8.2 inches | July 1998 |
| 20 | 8.2 inches | May 1997 |