At sea level, the climate is tropical—hot and humid with average yearly temperatures of about 27 °C (80.6 °F) and little daily variation. At the interior's higher altitudes, the average yearly temperature is 20 °C (68 °F), and nights are generally cool. Annual rainfall varies from 5,000 mm (196.9 in) on the southwestern slopes to 1,000 mm (39.4 in) in the northern lowlands. The rainy season runs from October to May.
The politics of São Tomé and Príncipe takes place in a framework of a unitary semi-presidential representative democratic republic, whereby the President of São Tomé and Príncipe is head of state and the Prime Minister of São Tomé and Príncipe is head of government, and of a multi-party system. Executive power is exercised by the government.
Officially name: Democratic Republic of São Tomé and Príncipe
Capital: São Tomé
Largest city: São Tomé
Official language: Portuguese
Government: Democratic semi-presidential Republic