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Sierra Leone Climate

To better understand our present and potential future climate, we need to understand what climate is and the climatic conditions in Sierra Leone. The term ‘climate’ is typically defined as the average weather over a 30-year period.
Sierra Leone has a tropical climate with distinct wet and dry seasons. The wet season starts in May and ends in November and is characterized by torrential rainfalls and high humidity. The dry season starts in December and ends in April, which includes harmattan, when cool, dry winds blow in off the Sahara Desert. Rainfall is highest in the coastal areas with annual downpour above 3500 mm and can be torrential during the months of July, August and September. Freetown receives the highest rainfall due to the proximity of the peninsula mountains. There is little variation in temperature throughout the year. However, it is cooler in the mountains of the northeast. The average temperature is 26 °C (78.8 °F) and varies from around 26 °C (78.8 °F) to 36 °C (96.8 °F) during the year, with night-time temperatures as low as 16 °C (60.8 °F).

Monthly Rainfall (From 1991 to 2015)
Extreme events such as floods, storms, thunder and lightning, landslides and mudslides have affected Sierra Leone since the dawn of time. The Office of National Security and the Sierra Leone Meteorological Agency provide a variety of information detailing these events categorized by type of event.