Advances in Geosciences www.adv-geosci.net 1680-7340 1680-7359 23 10th EGU Plinius Conference on Mediterranean Storms (2008) 2010 10.5194/adgeo-23-37-2010 http://www.adv-geosci.net/23/37/2010/ http://www.adv-geosci.net/23/37/2010/adgeo-23-37-2010.html http://www.adv-geosci.net/23/37/2010/adgeo-23-37-2010.pdf 37 45 2010-03-10 Study of the rain intensity in Athens and Thessaloniki, Greece C. M. Philandras P. T. Nastos nastos@geol.uoa.gr A. G. Paliatsos C. C. Repapis Research Centre for Atmospheric Physics and Climatology, Academy of Athens, Athens, Greece Laboratory of Climatology and Atmospheric Environment, University of Athens, Athens, Greece General Department of Mathematics, Technological Education Institute of Piraeus, Piraeus, Greece In this study, the mean rain intensity (mm/h) in Athens and Thessaloniki, Greece, is examined during the period 1930–2007. The daily meteorological data were acquired from the meteorological stations of the National Observatory of Athens (Thissio) and the University Campus of Thessaloniki. These stations have recorded the longest and reliable daily rain time series in Greece. <br><br> The trends of the annual and seasonal mean, as well as the maximum rain intensity, are analyzed. On the one hand, all of the time series in Athens present higher figures of mean rain intensity during the period 1990–2007 compared to the period 1930–1990. On the other hand, regarding the time series in Thessaloniki, the mean rain intensity remains in lower level than the respective one in Athens without significant trend at the Confidence Level (CL) 95%. As far as the annual and seasonal maximum rain intensity is concerned, similar patterns appear. However, the summer maximum rain intensity in Thessaloniki remains at higher levels till 1970's. 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