The diverse nature of the landscape and the existence of mountains parallel to the coasts cause varying climatic conditions throughout Turkey. The average altitude of the country is 1132 meters and only one fifth of the land lies lower than 500 meters. The south and west coasts are humid and tend to have little summer rainfall and high summer temperatures. This explains the popularity of these areas for summer holidays. Northern Anatolia, bordered by Black Sea coasts, is usually humid and rainy. The rainfall is sparse in Eastern Turkey and in Ankara, which experiences very hot, dry summers, and very cold winters with snowfall. Ankara enjoys four defined seasons. It is advised to check a weather forecast for Ankara on the Internet before departure.