Most of Europe lies in the temperate latitudes and only its most southern and northern parts are in the subtropics or north of the Arctic Circle. The influence of the Atlantic is enhanced by the warm Gulf Stream current and the very segmented European coastline. Of great importance is the location of the mountain ranges, which do not hinder the movement of air currents from the west to the east. Cyclonic activity is lower in summertime (the average rate during the warmest month is 28° in the south and 3° in the north), and in winter it increases (the average rate. During the coldest month is respectively 12° and 20°). In most of Europe there is enough rainfall but it is unevenly distributed. While rainfall in Western Europe is in surplus (in Scandinavia and Britain it is more than 2000 mm), in Eastern Europe it is insufficient (for example in the Caspian Sea Valley the rainfall is 100-500 mm). In Europe the temperatures are mostly temperate. The western regions are characterized by moderate coastal climate (with small annual temperature variations, mild winters and relatively warm summers) and the eastern regions are characterized by moderate continental climate (with significant variations in the average annual temperatures, cold winters, warm, and in some places very hot summers). The subtropical zone of Europe has Mediterranean climate (hot dry summers and mild wet winters).