issue_comments: 1068305154

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https://github.com/pydata/xarray/pull/6353#issuecomment-1068305154 https://api.github.com/repos/pydata/xarray/issues/6353 1068305154 IC_kwDOAMm_X84_rQsC 10194086 2022-03-15T18:13:39Z 2022-03-15T18:13:39Z MEMBER

Nice! I did not know about coarsen(...).construct(...) - interesting. I usually use set_index for that - could be interesting to test which approach is faster.

```python def _to_seasonal(ds):

year = ds.time.dt.year.data
season = ds.time.dt.season.data

# assign new coords
ds = ds.assign_coords(year=("time", year), season=("time", season))

# reshape the array to (..., "season", "year")
return ds.set_index(time=("year", "season")).unstack("time")

```

 
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