In this work, long-term (10 years) raindrop size distribution (RSD) measurements from the Joss-Waldvogel Disdrometer (JWD) installed at the National Central University (NCU) (24°58′6″N, 121°11′27″E), Taiwan, and the vertical profile of radar reflectivity were used to analyze the variations in the gamma parameters of six seasons (winter, spring, mei-yu, summer, typhoon, and autumn) and types of precipitation. The normalized gamma distribution of RSD revealed that the highest mean D m (mass-weighted average diameter) values occurred in the summer, whereas the highest mean log 10 N w (normalized intercept parameter) values were found in the winter. Furthermore, most of the rain falling at a rate of less than 20 mm h −1 occurs in Northern Taiwan. In this study, we used radar reflectivity to differentiate between convective and stratiform systems. It was revealed that the mean D m values are higher in convective systems, whereas the mean log 10 N w values are higher in stratiform systems. The structure of RSD in stratiform systems remains constant in all seasons; however, convection is similar