Georgia's climate is affected by subtropical influences from the west and continental influences from the east. The Greater Caucasus range moderates local climate by serving as a barrier against cold air from the north. Warm, moist air from the Black Sea moves easily into the coastal lowlands from the west. Climatic zones are determined by distance from the Black Sea and by altitude. Along the Black Sea coast, from Abkhazia to the Turkish border, and in the region known as the Kolkhida Lowlands inland from the coast, the dominant subtropical climate features high humidity and heavy precipitation ( per year; the Black Sea port of Batumi receives per year). Several varieties of palm trees grow in these regions, where the midwinter average temperature is and the midsummer average is .