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The best time to travel to Hamburg is probably during Spring/Summer.
For the most part Hamburg is a fairly wet and windy city, with winds blowing in moist air from the North Sea. Summers are warm but rainy, with occasional brief dry, sunny spells. Winters are cold, can be chilling to 28ºF (-2ºC) or below . January,I the the coldest month, that’s when the lakes in the city centre have been known to freeze enough for ice-skating. Starting in early December- Snowfall is mostly light Spring, when the city's thousands of trees come into bloom is very pleasant.