While the weather changes every day and a hot and humid day can be followed by a rainy one, the climate of a region remains the same for a long time. Thus, the summer season at the North Sea is generally cooler than in Freiburg and the winter season is rather cold and damp and not as snowy as in the Alps. The climate is driven by the sun, which heats up the air and gives rise to winds such as the trade wind. The oceans and the ocean currents also affect world climate, an instance of which can be seen in the way things turn topsy-turvy due to occurrence of ‘El Nino’. The climate also undergoes long-term changes.
