The climatic conditions in Cuba are in accordance to those existing in the subtropical zones, which tends to be moderate due to the proximity of the island to the Tropic of Cancer. Another thing in its favor is the long, narrow shape of the island which constantly receives trade winds and sea breezes.̉ Cuba has a short winter, a period filled with masses of cold air coming from the north. Temperatures range from 20̉º C to 35̉º C during the whole year, going down in rare occasions to 10̉º C. The eastern part of the country enjoys warmer temperatures than those registered in the western part, and the variations in temperature between day and night are less marked in the coastal areas than inland. Just off the coast, the average temperature of the water is higher than 25̉º C.