A Diploma Thesis titled ‘Correlation of road accidents and weather conditions’  was presented by Dimitris Bilionis in July 2011. The purpose of this diploma thesis is to investigate the correlation between accident counts and basic meteorological conditions, such as rainfall and temperature. For this reason, analytical daily data were used for the number of accidents, fatalities and injuries, as well as for the temperature and the precipitation. The results show that the drop of temperature causes a decrease in the number of accidents, while an increase in precipitation causes a decrease in the number of accidents and fatalities as well.