| Rank | Precipitation | Month |
|---|---|---|
| 1 | 4.8 inches | May 1948 |
| 2 | 4.7 inches | June 1950 |
| 3 | 4.4 inches | September 1940 |
| 4 | 4.2 inches | November 1897 |
| 5 | 4.0 inches | June 1941 |
| 6 | 3.8 inches | May 1998 |
| 7 | 3.7 inches | May 1991 |
| 8 | 3.6 inches | March 2012 |
| 9 | 3.6 inches | May 2011 |
| 10 | 3.6 inches | May 1941 |
| 11 | 3.6 inches | January 1970 |
| 12 | 3.5 inches | March 2017 |
| 13 | 3.4 inches | February 2019 |
| 14 | 3.4 inches | May 1942 |
| 15 | 3.4 inches | May 1956 |
| 16 | 3.3 inches | April 1978 |
| 17 | 3.3 inches | December 1964 |
| 18 | 3.2 inches | October 1940 |
| 19 | 3.2 inches | May 2005 |
| 20 | 3.2 inches | June 2022 |