| Rank | Precipitation | Month |
|---|---|---|
| 1 | 18.4 inches | May 1990 |
| 2 | 18.1 inches | June 2007 |
| 3 | 18.0 inches | May 2019 |
| 4 | 16.8 inches | May 1982 |
| 5 | 16.4 inches | July 1992 |
| 6 | 16.3 inches | May 1935 |
| 7 | 16.3 inches | April 1994 |
| 8 | 15.2 inches | May 1943 |
| 9 | 15.1 inches | April 1927 |
| 10 | 14.4 inches | July 1948 |
| 11 | 14.4 inches | September 1900 |
| 12 | 13.8 inches | September 1993 |
| 13 | 12.9 inches | September 1962 |
| 14 | 12.6 inches | September 1961 |
| 15 | 12.3 inches | May 1929 |
| 16 | 12.2 inches | July 1972 |
| 17 | 12.1 inches | March 1973 |
| 18 | 12.1 inches | June 1942 |
| 19 | 12.0 inches | October 1986 |
| 20 | 11.9 inches | June 2021 |