The report provides all climatological information required for the long term planning of flight operations in St.Gallen-Altenrhein. In part A the reader gets introduced to the geographical setting of the aerodrome, the important meteorological patterns of the region with notes and basic interpretation of the data. Information about the main weather patterns bases on the “Klimaatlas der Schweiz” (MeteoSwiss 1984, 1991, 1995) and the tables of this report. In part B the data is presented mainly in form of tables and graphics, allowing a direct view of the information.