The data contain the largest hailstone size by month and year, respectively, as well as the average number of days with hailstone sizes from 2 cm and 4 cm, respectively. Hailstone sizes cannot be measured on the ground over a large areas. The size is derived from radar measurements and describes the maximum expected hail size on one square kilometer based on the radar parameter MESHS (Maximum Expected Severe Hail Size). Due to the infrequent occurrence of hail, averaging of hailstone sizes over many years is not meaningful. The number of days from hailstone sizes of at least 2 cm and 4 cm is provided as climatology. These data allow a robust statement about the frequency of events of certain hailstone sizes. Hailstone sizes are given in classes from 2 cm to greater than 6 cm in 0.5 cm increments, with the lower end being inclusive and the upper end exclusive: the grid value 2 represents values from 2 cm (incl.) to 2.5 cm (excl.). DOI: https://doi.org/10.18751/Climate/Griddata/CHHC/1.0
