| Rank | Precipitation | Month |
|---|---|---|
| 1 | 9.2 inches | May 1908 |
| 2 | 6.3 inches | June 1944 |
| 3 | 6.0 inches | June 1913 |
| 4 | 5.7 inches | June 1907 |
| 5 | 5.4 inches | June 1925 |
| 6 | 5.2 inches | May 1915 |
| 7 | 5.1 inches | June 1964 |
| 8 | 5.0 inches | April 1902 |
| 9 | 4.9 inches | June 1923 |
| 10 | 4.8 inches | September 1940 |
| 11 | 4.8 inches | April 1903 |
| 12 | 4.7 inches | May 1927 |
| 13 | 4.7 inches | July 1915 |
| 14 | 4.6 inches | May 1923 |
| 15 | 4.6 inches | May 1921 |
| 16 | 4.5 inches | June 1963 |
| 17 | 4.3 inches | June 1915 |
| 18 | 4.3 inches | June 1948 |
| 19 | 4.1 inches | September 1909 |
| 20 | 4.1 inches | May 1906 |