id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
2021856935,PR_kwDOAMm_X85g81gb,8509,Proof of concept - public Grouper objects,2448579,open,0,,,0,2023-12-02T04:52:27Z,2024-03-15T05:18:18Z,,MEMBER,,1,pydata/xarray/pulls/8509,"Not for merging, just proof that it can be done nicely :)

Now builds on #8840
~Builds on an older version of #8507~

Try it out!

```python
import xarray as xr
from xarray.core.groupers import SeasonGrouper, SeasonResampler

ds = xr.tutorial.open_dataset(""air_temperature"")

# custom seasons! 
ds.air.groupby(time=SeasonGrouper([""JF"", ""MAM"", ""JJAS"", ""OND""])).mean()

ds.air.resample(time=SeasonResampler([""DJF"", ""MAM"", ""JJAS"", ""ON""])).count()
```","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/8509/reactions"", ""total_count"": 2, ""+1"": 2, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull