Update dependency xarray to v2026

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	Age	Confidence
xarray		major	>=2022.3.0,<=2025.10.1,!=2024.10.0,!=2024.11.0,!=2025.1.*,!=2025.3.*,!=2025.9.* → >=2026.2,<=2026.2.0,!=2024.10.0,!=2024.11.0,!=2025.1,!=2025.3,!=2025.9
xarray	project.dependencies	major	>=2022.3.0,<=2025.10.1,!=2024.10.0,!=2024.11.0,!=2025.1.*,!=2025.3.*,!=2025.9.* → >=2022.3.0,<=2026.2.0,!=2024.10.0,!=2024.11.0,!=2025.1,!=2025.3,!=2025.9

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Release Notes

pydata/xarray (xarray)

v2026.2.0

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v2026.1.0

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v2025.12.0

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This release rolls back the default engine for HTTP urls, adds support for DataTree objects in combine_nested and contains numerous bug fixes.

Thanks to the 16 contributors to this release:
Benoit Bovy, Christine P. Chai, Deepak Cherian, Dhruva Kumar Kaushal, Ian Hunt-Isaak, Ilan Gold, Illviljan, Julia Signell, Justus Magin, Lars Buntemeyer, Maximilian Roos, Miguel Jimenez, Nick Hodgskin, Richard Berg, Spencer Clark and Stephan Hoyer

What's Changed

• new release section by @​keewis in #​10926
• Fix numpy typing issue with numpy=2.3.5 by @​shoyer in #​10935
• support combine_nested on DataTree objects by @​shoyer in #​10849
• [pydap backend] enables downloading multiple dim arrays within single http request by @​Mikejmnez in #​10629
• Fix flaky Hypothesis stateful test for unique name generation by @​max-sixty in #​10946
• normalize the first indexer by @​keewis in #​10948
• Mostly restore netcdf backend behavior with URLs by @​ianhi in #​10931
• Adapt to change in behavior of pandas.Timestamp constructor by @​spencerkclark in #​10944
• DOC: Correct many grammatical issues by @​star1327p in #​10959
• avoid casting custom indexes in Dataset.drop_attrs by @​keewis in #​10961
• Fix type annotation for DataVariables to use Hashable instead of Any by @​dhruvak001 in #​10960
• Coerce IndexVariable to Variable when assigning to data variables or coordinates by @​jsignell in #​10909
• (fix): handle internal type promotion and nas for extension arrays properly by @​ilan-gold in #​10423
• Migrate development workflow to Pixi by @​VeckoTheGecko in #​10888
• Fix workflow name to embed matrix.pytest-addopts by @​VeckoTheGecko in #​10970
• Add GitHub Codespaces config for Pixi by @​VeckoTheGecko in #​10929
• small changes to the pixi env definitions by @​keewis in #​10976
• Use ._data in Variable._replace by @​dcherian in #​10969
• Support decoding unsigned integers to timedelta by @​dcherian in #​10972
• DOC: Remove RTD htmlzip output format by @​VeckoTheGecko in #​10977
• document limitations of cftime arithmetics by @​larsbuntemeyer in #​10653
• DOC: Add llms.txt generation to build process by @​VeckoTheGecko in #​10978
• release v2025.12.0 by @​keewis in #​10981
• set the release date by @​keewis in #​10984

New Contributors

• @​larsbuntemeyer made their first contribution in #​10653

Full Changelog: pydata/xarray@v2025.11.0...v2025.12.0

v2025.11.0

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This release changes the default for keep_attrs such that attributes are preserved by default, adds support for DataTree in top-level functions, and contains several memory and performance improvements as well as a number of bug fixes.

Thanks to the 21 contributors to this release:
Aled Owen, Charles Turner, Christine P. Chai, David Huard, Deepak Cherian, Gregorio L. Trevisan, Ian Hunt-Isaak, Ilan Gold, Illviljan, Jan Meischner, Jemma Jeffree, Jonas Lundholm Bertelsen, Justus Magin, Kai Mühlbauer, Kristian Bodolai, Lukas Riedel, Max Jones, Maximilian Roos, Niclas Rieger, Stephan Hoyer and William Andrea

What's Changed

• Blank whats new for 2025.10.2 by @​shoyer in #​10830
• Change keep_attrs default to True by @​max-sixty in #​10726
• Add support for DataTree to xarray.merge() by @​shoyer in #​10790
• Fix equivalent() for NumPy scalar NaN comparison by @​max-sixty in #​10838
• Fix Dataset.map to handle non-DataArray outputs by @​max-sixty in #​10839
• Support DataTree in xarray.concat() by @​shoyer in #​10846
• Fix typing for to_zarr() methods by @​shoyer in #​10847
• Add version requirement to matplotlib by @​Illviljan in #​10837
• Add chunks='auto' support for cftime datasets by @​charles-turner-1 in #​10527
• new dependency for zarr in the nightly ci by @​keewis in #​10857
• Add support for NETCDF4_CLASSIC to h5netcdf engine by @​huard in #​10686
• fix h5netcdf backend for format=None, use same rule as netcdf4 backend by @​kmuehlbauer in #​10859
• fix: be more cautious when guessing what a backend can open by @​ianhi in #​10804
• Update docs to reflect open_mfdataset default chunk behaviour by @​jemmajeffree in #​10567
• pre-commit hook maintenance by @​keewis in #​10871
• Fix empty indexing by @​kmuehlbauer in #​10870
• Minimize concat memory usage by @​dcherian in #​10866
• DOC: Correct typos: lets -> let's by @​star1327p in #​10874
• Use version-independent Zenodo DOI by @​gtrevisan in #​10881
• Import h5netcdf.core to use EnumType by @​maxrjones in #​10779
• Fix typing issue with numpy 2.3.4 by @​shoyer in #​10882
• xfail pydap datatree tests by @​shoyer in #​10869
• remove notes pointing to non-existing projects by @​KBodolai in #​10877
• [docs] Remove duplicated example in ".where" by @​jmeischner in #​10884
• Update pydap link in installation guide by @​nicrie in #​10885
• Fix drop_sel for a MultiIndex by @​owena11 in #​10863
• Switch to use cmap.with_extremes by @​Illviljan in #​10836
• fix: error handling decode_cf_var exceptions - use add_note by @​jonaslb in #​10886
• fix: don't expect string arrays to roundtrip in pandas by @​ilan-gold in #​10894
• DOC: Typo in terminology.rst by @​wjandrea in #​10897
• support datatree in assert_allclose by @​keewis in #​10887
• DOC: Correct typos like a/an usage by @​star1327p in #​10905
• Fix fill_value handling during unstack by @​peanutfun in #​10901
• Simplify implementation of merge() for DataTree by @​shoyer in #​10844
• Rewrite test_iso8601_decode to work without cftime by @​dcherian in #​10914
• DOC: Correct minor grammar issues by @​star1327p in #​10915
• skip ci based on a label by @​keewis in #​10918
• Optimize padding for coarsening. by @​dcherian in #​10921
• release v2025.11.0 by @​keewis in #​10917

New Contributors

• @​charles-turner-1 made their first contribution in #​10527
• @​KBodolai made their first contribution in #​10877
• @​jmeischner made their first contribution in #​10884
• @​owena11 made their first contribution in #​10863
• @​jonaslb made their first contribution in #​10886
• @​wjandrea made their first contribution in #​10897
• @​peanutfun made their first contribution in #​10901

Full Changelog: pydata/xarray@v2025.10.1...v2025.11.0

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