The greenhouse industry is expanding rapidly in Southern European countries. Due to the favorable meteorological conditions, low cost unheated greenhouses can be used to cultivate crops from late summer through to the end of the spring season. Very little information is available on the microclimate that exist under these simple plastic covered structures. The paper describes the wind, temperature and humidity fluctuationes, radiation and evaporation that characterizes the green' :Ouse enviroment in the Almería area. 1.-Introduction During the past 20 years the area of greenhouse structures in Spain has spread out along the Mediterranean Coast. The Campo de Dalias in Almería shows the biggest concentration. It is estimated that about 10.000 Hectars of greenhouses are located in this area. Low cost structures made with pale timber and steel wires are used for raising plants from September through June. Summer months are too hot to provide an adequate environment for plant growth, Mild winters free of snowfall make it possible to utilize such kinds of simple greenhouses. A single layer of polyethylene is attached between two nets of galvanized steel wires and anchored to the ground. Rigid members have been partially substituted by tensile supports. Next, the climate thai, exists under one of these greenhouses will be described. Data was recorded at the Estación Experimental

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