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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
1084854762 I_kwDOAMm_X85AqZHq 6087 Computing 'seasonal means' spanning 4 months (with resample or groupy) oliviermarti 2853966 closed 1     0 2021-12-20T14:27:20Z 2022-01-21T05:54:39Z 2022-01-21T05:54:39Z NONE      

Climatologists often use 'seasonal means', i.e. means over 3 months. Useful periods are DJF for December-January-February, MAM, JJA and SON. groupby or resample are nice functions to compute these seasonal means.

sea for example : https://xarray.pydata.org/en/stable/examples/monthly-means.html https://stackoverflow.com/questions/59234745/is-there-any-easy-way-to-compute-seasonal-mean-with-xarray

But some studies need means over 4 months : DJFM, MAMJ, JJAS and SOND. Would it be feasible that these 4-month periods are recognized by groupby and resample ?

For resample, we define 3-month means with a syntax like : resample(time='QS-DEC')

A resampling over 4 months is more tricky : it is not a real resampling, as some months are repeated. We still need 4 seasonal values ...

Thanks,

Olivier

 
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   completed xarray 13221727 issue

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