| Rank | Precipitation | Month |
|---|---|---|
| 1 | 8.6 inches | June 1907 |
| 2 | 7.0 inches | May 1908 |
| 3 | 6.5 inches | January 1909 |
| 4 | 5.9 inches | June 1908 |
| 5 | 5.4 inches | June 1911 |
| 6 | 4.7 inches | June 1984 |
| 7 | 4.5 inches | May 2011 |
| 8 | 4.3 inches | July 1909 |
| 9 | 4.2 inches | August 1993 |
| 10 | 4.1 inches | June 2018 |
| 10 | 4.1 inches | June 1925 |
| 12 | 4.1 inches | May 1906 |
| 13 | 4.1 inches | October 1925 |
| 14 | 4.0 inches | November 1910 |
| 15 | 3.9 inches | July 1993 |
| 16 | 3.9 inches | June 1894 |
| 17 | 3.8 inches | May 1917 |
| 18 | 3.8 inches | June 1913 |
| 19 | 3.8 inches | May 2005 |
| 20 | 3.7 inches | June 1993 |