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Weather in Waterloo
Average Weather
| Month | Average monthly max temperature | Average monthly min temperature |
| January | -3°C | -11°C |
| February | -1°C | -9°C |
| March | 7°C | -1°C |
| April | 14°C | 4°C |
| May | 20°C | 10°C |
| June | 26°C | 16°C |
| July | 27°C | 17°C |
| August | 27°C | 16°C |
| September | 24°C | 12°C |
| October | 16°C | 6°C |
| November | 7°C | 0°C |
| December | 0°C | -6°C |
