ERA5 total precipitation 0.5°x0.5° (monthly) 1940 to 2022

units: m w.e./day

annual precipitation: monthly values * number of days in corresponding
month => then summing up over the months

link to data:
https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels-monthly-means?tab=overview