The climate varies according to altitude. Lowland areas have a tropical climate. The dry season is from December to April and the rainy season from May to December. During the rainy season, there is the possibility of flooding in certain low-lying areas, such as the Llanos and in some valley of the Andes. Various parts of Venezuela, including Caracas and the eastern part of Sucre, are vulnerable to earthquakes, although there have been no serious earthquakes for many years. The best time to visit is between January and April.