cdo -yearpctl,99 RRmask.nc out.nc
Annual threshold for extreme heavy precipitation in rainy season: Let RRt be the daily precipitation amount on day t. For r99prs list all RRt of one year, but only in rainy season (which means rs1_ons≤t≤rs1_ces or rs2_ons≤t≤rs2_ces, for climatological rs1_ons, rs1_ces, rs2_ons, rs2_ces) and take the 99th percentile value.
Climate Modell Data
More information about the climate model data source and methods can be found in the text files of the head data set (DOI: 10.58160/99, see "IsPartOf-DOI").