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/2419#issuecomment-499721397,https://api.github.com/repos/pydata/xarray/issues/2419,499721397,MDEyOklzc3VlQ29tbWVudDQ5OTcyMTM5Nw==,1197350,2019-06-07T00:52:10Z,2019-06-07T00:52:10Z,MEMBER,"> This was to facilitate looking at the max and min as a function of ""month"", take the difference, and then average over ""year""

What about
```python
gb = ds.groupby('time.year')
gb.max(dim='time') - gb.min(dim='time')
```
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