Github user kwhitehall commented on the pull request:
https://github.com/apache/climate/pull/196#issuecomment-101124957
@huikyole thank you for your review. As the tix indicates, this is a bug.
If one tried to use month_start=12 and month_end=2 for a dataset, the code in
the if block tried to access the DS (Dataset) to apply the offset as oppose to
DS.values and hence was throwing an error.
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