It can be easily recognized that RH assumed higher values above the green area more than in the gravel, owing to the mentioned processes. Accordingly, in Refs. (135,371) it was shown that relative humidity is the most important climatic factor affecting evapotranspiration. During 2010, in low plant cover conditions, similar results were found, but the gravel air temperature was between 1 oc and 3 oc higher than green area. The greater fractional vegetative cover(80%) in 2012 resulted in an increased evapotranspiration; so it can be deducted that plants traspiration effect added to the substrate evaporation provided an overall enhanced air cooling above the green area.