Dominica experiences the year‐round warm, humid conditions associated with a maritime tropical climate. Mean temperature is around 26°C, dropping only to 24–25°C in the cooler months of December to February. During the warmest period of the year, a maximum of 33°C may be observed along the coast, compared to 27°C in the mountains. The wet season occurs from June to October, during which the island receives around 250–400 mm of rainfall per month. El Niño episodes bring warmer and drier than average conditions between June and August and La Niña episodes bring colder and wetter conditions at this time. Heavy rainfall associated with cyclones and hurricanes contributes significantly to wet season rainfall values. The occurrence of hurricanes is strongly linked to ENSO, with more frequent hurricane activity associated with La Niña events.
- Mean annual temperature has increased by around 0.7°C since 1960, at an average rate of 0.16°C per decade. According to the United Nations Development Program and the Tyndall Centre for Climate Change Research, there is insufficient daily observational data to identify trends in daily temperature extremes.
- 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.