| Rank | Precipitation | Month |
|---|---|---|
| 1 | 35.0 cm | July 1954 |
| 2 | 28.2 cm | July 1955 |
| 3 | 27.4 cm | July 1897 |
| 4 | 26.5 cm | June 1926 |
| 5 | 23.5 cm | August 2010 |
| 6 | 22.4 cm | May 1899 |
| 7 | 22.2 cm | July 1939 |
| 8 | 20.9 cm | August 1994 |
| 9 | 20.2 cm | July 1926 |
| 10 | 20.0 cm | July 2011 |
| 11 | 19.9 cm | July 1894 |
| 12 | 19.9 cm | August 1983 |
| 13 | 19.7 cm | August 2002 |
| 14 | 19.0 cm | October 1960 |
| 15 | 19.0 cm | July 1907 |
| 16 | 18.8 cm | July 1940 |
| 17 | 18.8 cm | June 1884 |
| 18 | 18.7 cm | July 1930 |
| 19 | 18.4 cm | July 2009 |
| 20 | 17.6 cm | May 2004 |