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The Cape Verde Atmospheric Observatory is located at Calhau on a NW facing sandy beach on Sao Vicente, adjacent to the ocean, with the prevailing trade winds blowing directly off the ocean. There are no obvious major coastal features such as extensive shallows or large seaweed beds. Such a site offers a rare opportunity for ground-based studies of clean marine air, free from local coastal macrophyte interferences. The site is 'downwind' of an area of high primary productivity (the Mauritanian upwelling). Year round average temperatures are between 26° and 30° C, with uninterrupted sunshine from November to May and a sporadic rainy season between the months of August and October. The winds can get quite strong all year round and during December-January the island can be influenced by dust originating from the Sahara.
 
For a complete seasonal assessment of influences see: Seasonal characteristics of tropical marine boundary layer air measured at the Cape Verde Atmospheric Observatory L.J. Carpenter et al. , J. Atmos. Chem. DOI 10.1007/s10874-011-9206-1, 2010.