The Dominican Republic is a tropical and maritime nation. Due to its varied topography, the Dominican Republic’s climate varies considerably over short distances and is the most varied in the entire Caribbean. The average annual temperature is 25°C (77°F). At higher altitudes, the average temperature is 18°C, while near the sea the average temperature is 28°C. Low temperatures of 0°C (32°F) are possible in the mountains, while high temperatures of 40°C (104°F) are possible in the sheltered valleys. January and February are the coolest months of the year, while August is the warmest. Snowfall can be observed on rare occasions on the summit of Pico Duarte.
The rainy season on the north coast lasts from November to January. Elsewhere, the rainy season extends from May to November, with May being the wettest month. The average annual rainfall nationwide is 1,500 millimetres, with averages of 350 millimetres in some parts of the Neiba Valley, while the Eastern Cordillera records an average of 2,740 millimetres. The driest part of the country is in the west.
Tropical cyclones hit the Dominican Republic every two years, with 65 % of the impacts occurring along the south coast. Hurricanes are most likely to occur between August and October. The last major hurricane to hit the country was Hurricane Georges in 1998.