I get an error for the Berlin map: Error in get_googlemap(centre=location, zoom=zoom, maptype=maptype,: HTTP 400 Bad Request The Google Maps Platform server rejected your request. The provided API key is invalid.
I would also like to calculate the daily NAO values (from the open data servers) in monthly averages. From 1950 to 2022, in 12 months per year, which means 72*12 calculations in the end. These NAO monthly averages should be integrated into the dataframe with the monthly precipitation averages anyway.