| Rank | Precipitation | Month |
|---|---|---|
| 1 | 7.0 inches | October 1916 |
| 2 | 6.6 inches | October 1972 |
| 3 | 6.2 inches | December 1908 |
| 4 | 5.8 inches | October 1912 |
| 5 | 5.3 inches | January 1993 |
| 6 | 5.0 inches | January 2005 |
| 7 | 5.0 inches | August 1968 |
| 8 | 4.8 inches | September 1927 |
| 9 | 4.7 inches | October 1941 |
| 10 | 4.4 inches | April 1926 |
| 11 | 4.3 inches | August 1987 |
| 12 | 4.3 inches | December 1978 |
| 13 | 4.3 inches | January 2010 |
| 14 | 4.2 inches | January 1914 |
| 15 | 4.2 inches | October 1974 |
| 16 | 4.2 inches | November 1905 |
| 17 | 4.2 inches | December 1906 |
| 18 | 4.1 inches | January 1957 |
| 19 | 4.0 inches | January 1978 |
| 20 | 4.0 inches | October 2018 |