The database contains physical and microwave single scattering properties of horizontally aligned frozen hydrometeors as large as 11 cm in diameter. A description of the aggregation model used for particle generation can be found in: Leinonen, J., and Szyrmer, W. (2015), Radar signatures of snowflake riming: A modeling study, Earth and Space Science, 2, 346– 358, doi:10.1002/2015EA000102. The code used for particle generation is freely available at: https://github.com/jleinonen/aggregation The scattering properties of particles were computed using discrete dipole approximation using ADDA software package (https://github.com/adda-team/adda) Terminal velocity of snowflakes was computed using 4 hydrodynamical models that were implemented as a part of snowScat library (https://github.com/OPTIMICe-team/snowScatt) Approximately one half of the snowflake structure files and one quarter of scattering properties (for X, Ku, Ka and W band) were generated for the publication of Leinonen and Szyrmer (2015). The remaining part of the dataset was generated using the ALICE High Performance Computing Facility at the University of Leicester.