OBJECTIVES: The purpose of our present study was to investigate whether the time of onset of an acute cerebrovascular event demonstrates a seasonal variation, and whether the occurrence of this is influenced by certain meteorological factors. METHODS: We have examined patients admitted to the Department of Neurology in Hungary between 2005 and 2007 with the diagnosis of a cerebral hemorrhage (n=11,604) or a transient ischemic attack (n=12,513). Data was collected from the database of the Hungarian National Health Insurance Fund on the basis of International Classification of Diseases (ICD). (ICD codes G4580, G4590, I6100-I6190). Meteorological data (temperature, atmospheric pressure, relative humidity) was retrieved from the National Meteorology Service. Statistical analysis was carried out with SPSS 14.0 for Windows. RESULTS: Analysis of meteorological data showed that an increase in average temperature on the previous day resulted in a notable drop of cerebral hemorrhage incidence during all seasons (p<0.05), while in case of  transient ischemic attack such a decrease only occurred during Summer (p<0.05). Examining atmospheric pressure and relative humidity (p<0.05) only a demonstrative variation was found in case of cerebral infarction. CONCLUSIONS: In summary, our results indicate that the incidence of cerebral infarction, cerebral hemorrhage, and a transient ischemic attack show a typical variation depending on the season of the year and temperature as well have an influence in the development of different cerebrovascular events.