The climate varies according to altitude. Lowland areas have a tropical climate, while mountainous regions are significantly cooler. Pack a sweater or jacket if you're planning to spend any time in the Andes. The rainy season runs from May to December. During this period, there is the possibility of flooding in certain low-lying areas, such as the Llanos and in some valleys 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 ones for many years.