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/690#issuecomment-167932904,https://api.github.com/repos/pydata/xarray/issues/690,167932904,MDEyOklzc3VlQ29tbWVudDE2NzkzMjkwNA==,1217238,2015-12-30T04:01:42Z,2015-12-30T04:01:51Z,MEMBER,"This is a good idea, but it's not currently supported. You could do something like this, though:

``` python
hourofyear = (ds['time.dayofyear'] * 24 + ds['time.hourofday']).rename('hourofyear')
result = ds['TEMP'].groupby(hourofyear).mean('time')
```
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