issues: 250751931

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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
250751931 MDU6SXNzdWUyNTA3NTE5MzE= 1509 Unexpected behavior with DataArray.resample(how='sum') in presence of NaNs 5564291 closed 0     3 2017-08-16T20:36:28Z 2017-08-17T15:20:22Z 2017-08-16T23:23:38Z NONE      

The behavior of DataArray.resample is different for 'sum' and 'mean': import xarray as xr import numpy as np import pandas as pd x = xr.DataArray([1, np.nan], coords=[('t', pd.date_range('2017-08-01', '2017-08-02'))]) x.resample('D', 't', how='mean') # returns [1, nan] x.resample('D', 't', how='sum') # returns [1, 0] Setting skipna=False returns [1, nan] in both cases. I find the behavior of 'sum' unexpected. 

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