| Rank | Precipitation | Month |
|---|---|---|
| 1 | 32.9 cm | May 1940 |
| 2 | 29.3 cm | September 1899 |
| 3 | 28.0 cm | July 1954 |
| 4 | 27.7 cm | June 1979 |
| 5 | 26.7 cm | July 1941 |
| 6 | 26.3 cm | July 1957 |
| 7 | 25.6 cm | May 1933 |
| 8 | 24.6 cm | June 1953 |
| 9 | 24.4 cm | May 1965 |
| 10 | 23.7 cm | July 1989 |
| 11 | 23.4 cm | July 1926 |
| 12 | 23.2 cm | July 1903 |
| 13 | 23.0 cm | June 2021 |
| 14 | 23.0 cm | July 1955 |
| 15 | 22.9 cm | May 1964 |
| 16 | 22.7 cm | July 1953 |
| 17 | 22.7 cm | May 1949 |
| 18 | 22.0 cm | July 2007 |
| 19 | 21.9 cm | June 1926 |
| 20 | 21.7 cm | May 2000 |