| Rank | Precipitation | Month |
|---|---|---|
| 1 | 10.0 inches | May 1941 |
| 2 | 9.8 inches | August 1981 |
| 3 | 8.9 inches | July 1982 |
| 4 | 8.7 inches | June 1932 |
| 5 | 8.6 inches | July 1996 |
| 6 | 8.6 inches | July 1958 |
| 7 | 8.4 inches | September 1985 |
| 8 | 7.5 inches | July 1972 |
| 9 | 7.2 inches | May 1914 |
| 10 | 7.0 inches | July 1988 |
| 11 | 7.0 inches | June 1993 |
| 12 | 6.9 inches | August 1923 |
| 13 | 6.8 inches | June 1920 |
| 14 | 6.8 inches | October 1930 |
| 15 | 6.8 inches | July 1941 |
| 16 | 6.6 inches | May 2023 |
| 17 | 6.3 inches | May 1928 |
| 18 | 6.3 inches | August 1977 |
| 19 | 6.1 inches | August 1948 |
| 20 | 6.1 inches | June 1923 |