Average yearly rainfall amounts in the lowlands and plains range from an arid 180 mm (7 in) in the Paraguaná Peninsula – the driest part of South America outside the Arid Diagonal – to around 1,000 mm (39 in) in the Orinoco Delta and to 2,200 mm (87 in) or more in Los Llanos and Amazonas. Rainfall in mountainous areas varies considerably; sheltered valleys receive little rain, but slopes exposed to the northeast trade winds experience heavy rainfall. Caracas averages 910 mm (36 in) of precipitation annually, with very little rain falling from January to March.