Country

Guinea

Explore historical and projected climate data, climate data by sector, impacts, key vulnerabilities and what adaptation measures are being taken. Explore the overview for a general context of how climate change is affecting Guinea.

Current Climate Climatology

This page presents Guinea's climate context for the current climatology, 1991-2020, derived from observed, historical data. Information should be used to build a strong understanding of current climate conditions in order to appreciate future climate scenarios and projected change. You can visualize data for the current climatology through spatial variation, the seasonal cycle, or as a time series. Analysis is available for both annual and seasonal data. Data presentation defaults to national-scale aggregation, however sub-national data aggregations can be accessed by clicking within a country, on a sub-national unit.  Other historical climatologies can be selected from the Time Period dropdown list. Data for  specific coordinates can be downloaded for in the Data Download page.

Observed, historical data is produced by the Climatic Research Unit (CRU) of University of East Anglia. Data is presented at a 0.5º x 0.5º (50km x 50km) resolution.

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Climate Data Historical

Guinea is divided into two climatic zones: the tropical zone for most of the territory and the subequatorial for South East Guinea. The annual rainfall regime is uni-modal. The year is divided into two distinct seasons: a dry and a wet. The wet season takes place from May to October, followed by a dry season from November to April. Temperatures are high and constant. The country is characterized by significant climatic differences, due in large part to the variety of the relief. The sub-Guinean tropical climate in Lower Guinea has average temperatures quite constant: 23° and 25°C and significant rainfall, between 2100 and 5000 mm, with a monthly maximum of over 1000 mm in August. In the tropical mountain climate type, in Middle Guinea, the two seasons are of approximately equal duration and the rainfall varies from 1600 mm to 2000 mm. 

Temperature

  • The average annual temperature in Guinea has increased by 0.8°C since 1960 with an average rate of 0.18°C per decade.
  • The occurrence of ‘hot’ nights per year has increased significantly in all season in Guinea.
  • The frequency of ‘cold’ nights per year has decreased significantly; the average number of ‘cold’ nights per year has decreased by 21 nights since 1960.

Precipitation

  • Mean annual rainfall has decreased since 1960.
  • April-June rainfall has decreased at a rate of 5.3 mm per month per decade.
  • Observed precipitation data from 9 rainfall stations around the country, all indicate decreasing trends in May-October (rainy season) precipitation over 1951-2000.
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