| Rank | Precipitation | Month |
|---|---|---|
| 1 | 4.9 inches | May 2005 |
| 2 | 4.4 inches | May 1998 |
| 3 | 4.3 inches | December 1996 |
| 4 | 4.1 inches | August 1968 |
| 5 | 4.1 inches | December 1964 |
| 6 | 3.8 inches | February 1986 |
| 7 | 3.7 inches | May 2015 |
| 8 | 3.5 inches | January 1950 |
| 9 | 3.5 inches | December 1983 |
| 10 | 3.5 inches | January 1936 |
| 11 | 3.3 inches | September 2016 |
| 12 | 3.3 inches | January 1956 |
| 13 | 3.1 inches | June 1944 |
| 14 | 3.1 inches | June 2009 |
| 15 | 3.1 inches | January 1970 |
| 16 | 3.0 inches | October 1920 |
| 17 | 3.0 inches | October 2016 |
| 18 | 2.9 inches | May 1930 |
| 19 | 2.9 inches | May 2010 |
| 20 | 2.9 inches | May 1991 |