 As a result, Bremen has the lowest high point of all the German states.Bremen has a moderate oceanic climate (Köppen climate classification "Cfb") due to its proximity to the North Sea coast and temperate maritime air masses that move in with the predominantly westerly winds from the Atlantic Ocean.However, periods in which continental air masses predominate may occur at any time of the year and can lead to heat waves in the summer and prolonged periods of frost in the winter.