The long extent of the Phoenician coast, and the great difference in the elevation of its various parts, give it a great diversity of climate. Northern Phoenicia is many degrees colder than southern; and the difference is still more considerable between the coast tracts and the more elevated portions of the mountain regions. The greatest heat is experienced in the plain of Sharon,[21] which is at once the most southern portion of the country, and the part most remote from any hills of sufficient elevation to exert an important influence on the temperature. Neither Carmel on the north, nor the hills of Samaria on the east, produce any sensible effect on the climate of the Sharon lowland. The heat in summer is intense, and except along the river courses the tract is burnt up, and becomes little more than an expanse of sand. As a compensation, the cold in winter is very moderate. Snow scarcely ever falls, and if there is frost it is short-lived, and does not penetrate into the ground.[22] Above Carmel the coast tract is decidedly less hot than the region south of it, and becomes cooler and cooler as we proceed northwards. Northern Phoenicia enjoys a climate that is delightful, and in which it would be difficult to suggest much improvement. The summer heat is scarcely ever too great, the thermometer rarely exceeding 90º of Fahrenheit,[23] and often sinking below 70º. Refreshing showers of rain frequently fall, and the breezes from the north, the east, and the south-east, coming from high mountain tracts which are in part snow-clad, temper the heat of the sun’s rays and prevent it from being oppressive. The winter temperature seldom descends much below 50º; and thus the orange, the lemon and the date-palm flourish in the open air, and the gardens are bright with flowers even in December and January. Snow falls occasionally, but it rarely lies on the ground for more than a few days, and is scarcely ever so much as a foot deep. On the other hand, rain is expected during the winter-time, and the entire line of coast is visited for some months with severe storms and gales, accompanied often by thunder and violent rain,[24] which strew the shore with wrecks and turn even insignificant mountain streams into raging torrents. The storms come chiefly from the west and north-west, quarters to which the harbours on the coast are unfortunately open.[25] Navigation consequently suffers interruption; but when once the winter is past, a season of tranquillity sets in, and for many months of the year--at any rate from May to October[26]--the barometer scarcely varies, the sky is unclouded, and rain all but unknown.