pydata/xarray

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N-D labeled arrays and datasets in Python

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Forks: 1.4k
Open beginner issues: 3
Indexed issues: 1.1k
Avg merge: 2d 15h
Merged PRs (30d): 14

Dominant language: Python
License: Apache-2.0
Last GitHub push: Sep 11, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

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1,126 open issues indexed

Use `zarr.Array.async_array` Open

topic-zarr

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

pydata/xarray#11259 · Opened Mar 25, 2026
`coords.update()` converts CuPy arrays to NumPy for dimension coordinates Open

needs triage

Difficulty 4/5 3-5 days Newbie friendliness 48/100

pydata/xarray#11251 · 10 comments · Opened Mar 20, 2026
Add tests for timezone aware ExtensionArrays Open

extension-arrays topic-arrays

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/xarray#11248 · Opened Mar 19, 2026
Feature Request: First-class representation of nested attributes Open

enhancement topic-html-repr

Difficulty 5/5 Over a week Newbie friendliness 30/100

pydata/xarray#11240 · Opened Mar 17, 2026
Request a warning for when coord names are ignored when dims are specified Open

topic-error reporting

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pydata/xarray#11234 · 2 comments · Opened Mar 16, 2026
`chunks` argument is typed incorrected in `open_zarr` Open

contrib-good-first-issue topic-typing

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

pydata/xarray#11221 · 1 comment · Opened Mar 9, 2026
Multi-coordinate indexes are dropped when not all associated coordinates survive `_replace_maybe_drop_dims` Open

needs triage

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pydata/xarray#11215 · 4 comments · Opened Mar 6, 2026
DOC: Add open source diagram tooling Open

enhancement needs discussion topic-documentation

Difficulty 5/5 Over a week Newbie friendliness 30/100

pydata/xarray#11214 · 4 comments · Opened Mar 6, 2026
Unable to run groupby, map after shuffle_to_chunks Open

bug needs triage

Difficulty 4/5 3-5 days Newbie friendliness 48/100

pydata/xarray#11212 · Opened Mar 3, 2026
Assigning a DataArray with different shape to Dataset variable does not update the variable Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pydata/xarray#11206 · 1 comment · Opened Feb 27, 2026
Support glob patterns in `open_datatree(group=...)` for selective group loading Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

pydata/xarray#11196 · Opened Feb 22, 2026
h5netcdf not tested in nightly run Open

CI

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

pydata/xarray#11194 · 2 comments · Opened Feb 22, 2026
Proposal: Support explicit mesh coordinates in `xarray.plot.pcolormesh` Open

enhancement topic-plotting

Difficulty 5/5 Over a week Newbie friendliness 35/100

pydata/xarray#11193 · 2 comments · Opened Feb 21, 2026
DataArray.groupby drops empty coordinates Open

bug topic-groupby

Difficulty 3/5 1-2 days Newbie friendliness 48/100

pydata/xarray#11188 · 3 comments · Opened Feb 20, 2026
groupby multiple variables should include observed groups only Open

plan to close topic-groupby usage question

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pydata/xarray#11178 · 3 comments · Opened Feb 17, 2026
Scalars coordinates have no memory on their DataArray Open

design question usage question

Difficulty 5/5 Over a week Newbie friendliness 35/100

pydata/xarray#11176 · 6 comments · Opened Feb 16, 2026
Refactor async datatree loading to reuse open_groups_as_dict_async Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pydata/xarray#11131 · 1 comment · Opened Feb 3, 2026
Appending to Zarr store on disk changes dimension metadata Open

bug needs triage

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pydata/xarray#11101 · 2 reactions · Opened Jan 23, 2026
.swap_dims() loses indexes of non-dimension variables Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pydata/xarray#11099 · 4 comments · Opened Jan 22, 2026
open_mfdataset segfaults when using engine="netcdf4" and Prallel=Tru Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pydata/xarray#11088 · 2 comments · 1 reaction · Opened Jan 15, 2026
more sophisticated type checking with numpy Open

CI contrib-help-wanted enhancement topic-typing

Difficulty 5/5 Over a week Newbie friendliness 30/100

pydata/xarray#11086 · 8 comments · 3 reactions · Opened Jan 12, 2026
Improve IDE/Editor Support for External Accessors Open

enhancement topic-typing

Difficulty 5/5 Over a week Newbie friendliness 45/100

pydata/xarray#11078 · 29 comments · 3 reactions · Opened Jan 9, 2026
Add a `strict` argument to `resample`. Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/xarray#11077 · Opened Jan 9, 2026
Support CF Aggregation Variables Open

enhancement topic-backends

Difficulty 5/5 Over a week Newbie friendliness 30/100

pydata/xarray#11072 · 2 comments · Opened Jan 7, 2026
`expand_dims` creates `object` dtype for string coordinates instead of inferring string dtype Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

pydata/xarray#11061 · Opened Dec 30, 2025
Built in Index for 2D (or higher) coord Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 28/100

pydata/xarray#11040 · 4 comments · Opened Dec 19, 2025
Feat: Add a mechanism for Serializing any index - `to_zarr` on a big RangeIndex causes a crash Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

pydata/xarray#11034 · 2 comments · Opened Dec 18, 2025
DOC: Make explanation image for Reprs Open

topic-documentation topic-html-repr

Difficulty 5/5 Over a week Newbie friendliness 30/100

pydata/xarray#11031 · 4 comments · 4 reactions · Opened Dec 17, 2025
`encoding['chunksizes']` can become stale after `isel()` removes a dimension Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/xarray#11028 · 1 comment · Opened Dec 17, 2025
Problem using assign_attrs() in map() Open

needs triage

Difficulty 3/5 1-2 days Newbie friendliness 48/100

pydata/xarray#11019 · 1 comment · Opened Dec 16, 2025
Allow Custom Indexes to define HTML repr for managed coords Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 30/100

pydata/xarray#11018 · 4 comments · Opened Dec 15, 2025
Allow us to create space and later write to an existing NetCDF file object Open

needs triage

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/xarray#11012 · 1 comment · Opened Dec 12, 2025
Inconsistent behavior for `hue` between scatter and line Open

bug topic-plotting

Difficulty 3/5 1-2 days Newbie friendliness 42/100

pydata/xarray#10998 · 2 comments · 1 reaction · Opened Dec 8, 2025
`.sel()` fails on `datetime64[s]` object Open

bug upstream issue

Difficulty 3/5 1-2 days Newbie friendliness 48/100

pydata/xarray#10975 · 5 comments · Opened Dec 3, 2025
String type casting error during concatenating Open

bug needs triage topic-combine

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/xarray#10968 · 2 comments · Opened Dec 2, 2025
where/join/concat failures using esoteric dtypes Open

bug extension-arrays needs triage

Difficulty 4/5 3-5 days Newbie friendliness 38/100

pydata/xarray#10965 · 7 comments · Opened Dec 2, 2025
Variious tests fail on x86 (32-bit issues)? Open

bug needs triage

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pydata/xarray#10956 · 2 comments · Opened Nov 28, 2025
Deprecation Cycle for `netcdf4` backend URL behavior Open

needs triage

Difficulty 5/5 Over a week Newbie friendliness 20/100

pydata/xarray#10951 · 1 reaction · Opened Nov 26, 2025
xarray.load_dataarray fails when loading a DataArray with coordinates via zarr-fsspec Open

bug needs triage

Difficulty 3/5 1-2 days Newbie friendliness 48/100

pydata/xarray#10950 · 5 comments · Opened Nov 26, 2025
Disable explicit mypy tests? Open

CI

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pydata/xarray#10934 · 3 comments · Opened Nov 20, 2025
Memory overflow when concatenating Dask-backed DataArrays with mixed dtypes (Boolean and Float) Open

bug needs triage

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/xarray#10928 · Opened Nov 18, 2025
Better support for symbolic (e.g. jax tracer) values in non-index coordinates Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 42/100

pydata/xarray#10924 · 16 comments · Opened Nov 17, 2025
`sum(..., skipna=True)` should dispatch to `sparse.nansum` for sparse arrays Open

topic-arrays topic-performance

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pydata/xarray#10922 · 9 comments · Opened Nov 14, 2025
Astropy quantities are converted to bare arrays when creating an Index Open

topic-arrays topic-indexing

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pydata/xarray#10920 · 3 comments · Opened Nov 13, 2025
Support `create_index: bool` in `to_dataframe` to skip creating MultiIndex Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 48/100

pydata/xarray#10912 · 1 reaction · Opened Nov 12, 2025
Maximum value not always included in pcolormesh output when levels are requested Open

bug contrib-help-wanted topic-plotting

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pydata/xarray#10911 · 2 comments · Opened Nov 12, 2025
to_zarr with regions does not respect dim names -- only order. Open

topic-documentation topic-zarr

Difficulty 4/5 3-5 days Newbie friendliness 38/100

pydata/xarray#10891 · 1 comment · Opened Nov 3, 2025
Confusing error message when reducing over non-existent dimension Open

bug topic-error reporting topic-groupby

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pydata/xarray#10875 · 2 comments · Opened Oct 24, 2025
static spatiotemporal train/val/test splits for dataset Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/xarray#10853 · 1 comment · Opened Oct 14, 2025
Dataset Index not included as DataFrame column in `._to_dataframe()` when name different from dimension name Open

bug needs triage

Difficulty 3/5 1-2 days Newbie friendliness 72/100

pydata/xarray#10851 · 5 comments · Opened Oct 14, 2025

pydata/xarray

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