The warmest month (with the highest average high temperature) is July (19°C).
Months with the lowest average high temperature are January and February (-1°C).
The month with the highest average low temperature is July (12°C).
The coldest month (with the lowest average low temperature) is February (-6°C).
The best month for swimming (with the highest average sea temperature) is August (14.2°C).
The coldest month (with the lowest average sea temperature) is March (4.8°C).