| Rank | Precipitation | Month |
|---|---|---|
| 1 | 9.5 inches | May 1908 |
| 2 | 8.0 inches | June 1944 |
| 3 | 7.4 inches | June 1969 |
| 4 | 7.0 inches | May 1981 |
| 5 | 6.8 inches | June 1947 |
| 6 | 6.6 inches | May 1952 |
| 7 | 5.8 inches | May 2022 |
| 8 | 5.7 inches | May 1980 |
| 9 | 5.6 inches | May 1938 |
| 10 | 5.5 inches | September 1909 |
| 11 | 5.5 inches | May 2007 |
| 12 | 5.5 inches | June 1992 |
| 13 | 5.3 inches | May 1991 |
| 14 | 5.1 inches | May 1927 |
| 15 | 5.0 inches | May 1896 |
| 16 | 5.0 inches | May 1988 |
| 17 | 5.0 inches | May 1901 |
| 18 | 5.0 inches | June 1998 |
| 18 | 5.0 inches | June 2001 |
| 20 | 5.0 inches | July 1993 |