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This paper presents a large parameter study on meteorological conditions to investigate the aerodynamic performance degradation of UAVs for a wide range of icing conditions. The knowledge about weather influences is essential for the development of efficient icing protection. The numerical CFD simulations for ice accretion and performance evaluation were performed on the 2D airfoil RG-15, using FENSAPICE. The method is validated with literature and experimental data. The results show a significant deterioration of lift and drag for all selected icing conditions and a distinct dependency of temperature, liquid water content and ice mass on the aerodynamic performance.