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/805#issuecomment-201992240,https://api.github.com/repos/pydata/xarray/issues/805,201992240,MDEyOklzc3VlQ29tbWVudDIwMTk5MjI0MA==,2443309,2016-03-27T05:00:49Z,2016-03-27T05:00:49Z,MEMBER,"It doesn't really seem like `reference_time` is a ""coordinate"" variable. Being a scalar, you are not going to use it as a coordinate in the same sense as lat/lon/time.  Nevertheless, your example works if  you cast the `Period` to a DataArray first:

``` Python
ds = xr.Dataset({'temperature': (['x', 'y', 'time'],  temp),
                 'precipitation': (['x', 'y', 'time'], precip)},
                 coords={'lon': (['x', 'y'], lon),
                         'lat': (['x', 'y'], lat),
                         'time': pd.date_range('2014-09-06', periods=3),
                         'reference_time': xr.DataArray(pd.Period('2014'))})
```
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