| Year | Average rain/10 years |
| 1901 | 144.4524 |
| 1910 | 146.2408 |
| 1920 | 144.9641 |
| 1930 | 150.4393 |
| 1940 | 148.9023 |
| 1950 | 152.9573 |
| 1960 | 159.5338 |
| 1970 | 156.1968 |
| 1980 | 150.1271 |
| 1990 | 150.6118 |
| 2000 | 152.3903 |
| 2010 | 151.0454 |
| 2015 | 155.4274 |