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/pull/2433#issuecomment-427422040,https://api.github.com/repos/pydata/xarray/issues/2433,427422040,MDEyOklzc3VlQ29tbWVudDQyNzQyMjA0MA==,2448579,2018-10-05T16:22:31Z,2018-10-05T16:22:31Z,MEMBER,"True. 

The equivalent for facetgrid is 
```
g = air.isel(time=slice(0, 2)).plot.contour(col='time', colors='k')
for cs, ax in zip(g._mappables, g.axes.flat):
    ax.clabel(cs)
```

So adding this would make that a little more convenient. If not, I can send in a PR to document this bit (the use of `_mappables` is not very obvious; maybe we should make it public?)
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