 Snowfall and the period of snow cover are variable; whereas in some years, hardly any snow accumulation occurs, there has recently been a series of unusually snowy winters, peaking in the record year 2010 counting 84 days with a snow cover.Nevertheless, snow accumulation of more than 20 centimetres (8 in) remains exceptional, the record being of snow on 18 February 1979.The warmest months in Bremen are June, July, and August, with average high temperatures of .