The islands are of volcanic origin with extremely rich soil. Grenada’s interior is very mountainous with Mount St. Catherine being the highest at 840 m. Several small rivers with beautiful waterfalls flow into the sea from these mountains. The climate is tropical: hot and humid in the rainy season and cooled by the trade winds in the dry season. Grenada, being on the southern edge of the hurricane belt, has suffered only three hurricanes in fifty years.
Hurricane Janet passed over Grenada on September 23, 1955, with winds of 185 km/h, causing severe damage. The most recent storms to hit have been Hurricane Ivan on September 7, 2004, causing severe damage and thirty-nine deaths and Hurricane Emily on July 14, 2005, causing serious damage in Carriacou and in the north of Grenada which had been relatively lightly affected by Hurricane Ivan.