Dominica’s climate is characterized as tropical maritime with dominant influences being the Atlantic Ocean, the Caribbean Sea, and the northeasterly trade winds. As a result of its mountainous terrain the island possesses a number of micro-climates. Rainfall is distributed between a dry season from December to May and a rainy season from June to November. The western Caribbean coast is in the rain shadow of the various mountain ranges and average rainfall along that coast is significantly less than in interior locations. Dominica’s rugged topography results in considerable amounts of orographic rainfall making the island susceptible to landslides particularly in mountainous areas. The dry season is from February to April and the rainy season is from June to October. The spring months, from February to April, are the driest. The heaviest rains fall during late summer and fall (August to December). The average yearly rainfall ranges from about 1,900 mm (along the coast) to 5,000 mm (inland). Hurricanes coming in from the Atlantic Ocean can be expected during summer months, usually between June and October. The peak of hurricane season is late August to early September. The island’s climate is characterized by consistently warm year-round temperatures with a daytime average of 26°C in coastal areas decreasing to 19-21°C in mountainous areas, while night-time temperatures vary from 18-22°C on the coast and 10-12°C at higher elevations. Average annual temperature is 27°C.
- Both maximum and minimum temperatures have increased in the recent past.
- Mean annual temperature has increased by around 0.7°C since 1960, at an average rate of 0.16°C per decade.
- The frequency of hot days and hot nights increased and the frequency of cold days and cold nights has decreased between 1960 and 2003.
- Mean rainfall over Dominica has decreased in the months of March-August by 11–18 mm per month (6–7%) per decade, but this increase is not statistically significant as it is partially offset by decreases of around 7 mm per month (3%) per decade in December, January, and February.
This section provides the options to visualize historical climate data for different timeframes via map and annual cycle chart.