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/819#issuecomment-206417958,https://api.github.com/repos/pydata/xarray/issues/819,206417958,MDEyOklzc3VlQ29tbWVudDIwNjQxNzk1OA==,2443309,2016-04-06T15:04:55Z,2016-04-06T15:04:55Z,MEMBER,"@forman - 

The main reason this isn't supported yet is that we haven't implemented it yet. I recently added the `Rolling` object to `xarray` and our initial application aimed to wrap the [`bottleneck` moving window functions](http://berkeleyanalytics.com/bottleneck/reference.html#bottleneck.move_mean). Because the bottleneck moving window functions only supports one windowing axis, we have also adopted that constraint for now. 

At this point, I don't know of any plans to extend this functionality although we could discuss further.  The complexity of N-D rolling aggregations does increase a fair bit and we would ideally like to let a lower level package (e.g. bottleneck) handle most of that. Since you seem to have a tangible application for the N-D rolling feature, maybe this is something you want to contribute to?
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