html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/7042#issuecomment-1248529133,https://api.github.com/repos/pydata/xarray/issues/7042,1248529133,IC_kwDOAMm_X85Kawrt,35968931,2022-09-15T19:36:46Z,2022-09-15T19:36:46Z,MEMBER,"Hi @rogomichael, thanks for raising your issue.

Could you possibly turn your problem into a [minimal reproducible example](https://github.com/pydata/xarray/discussions/5404)? That would make it much easier for us to help you.

You've included a lot of code, but from looking at it it seems to me that the only lines which matter are

```python
nc_file = xr.open_mfdataset('year2019.nc')

nc_file[""tg""].sel(
    longitude=[state_lon[0], state_lon[1]],
    latitude=[state_lat[0], state_lat[1]],
    method=""nearest""
)
```

This suggests to me that your original file has duplicate values, as all xarray has done here is open it.

(However I still am not going to be able to reproduce this error without access to the file `year2019.nc`.)

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