| Rank | Precipitation | Month |
|---|---|---|
| 1 | 15.9 inches | June 1967 |
| 2 | 14.9 inches | July 1993 |
| 3 | 14.4 inches | September 1926 |
| 4 | 14.3 inches | July 1973 |
| 5 | 12.4 inches | June 1947 |
| 6 | 12.0 inches | June 2018 |
| 7 | 11.9 inches | August 2002 |
| 8 | 11.6 inches | April 1984 |
| 9 | 10.9 inches | June 2010 |
| 10 | 10.5 inches | June 1990 |
| 11 | 10.1 inches | September 1965 |
| 12 | 10.0 inches | August 1987 |
| 13 | 9.9 inches | July 1988 |
| 14 | 9.9 inches | May 1896 |
| 15 | 9.8 inches | June 1909 |
| 16 | 9.5 inches | May 1903 |
| 17 | 9.5 inches | July 1902 |
| 18 | 9.4 inches | August 1928 |
| 19 | 9.3 inches | June 1902 |
| 20 | 9.2 inches | August 2018 |