This release extends xarray's support for custom index classes, restores support for reading netCDF3 files with SciPy, updates minimum dependencies, and fixes a number of bugs.

Thanks to the 17 contributors to this release:
Bas Nijholt, Benoit Bovy, Deepak Cherian, Dhruva Kumar Kaushal, Dimitri Papadopoulos Orfanos, Ian Hunt-Isaak, Kai Mühlbauer, Mathias Hauser, Maximilian Roos, Miguel Jimenez, Nick Hodgskin, Scott Henderson, Shuhao Cao, Spencer Clark, Stephan Hoyer, Tom Nicholas and Zsolt Cserna

What's Changed

• new whats-new section by @mathause in #10420
• Fix Pydap tests for numpy 2.3.0 changes (scalar string to unicode) by @kmuehlbauer in #10421
• Fixed color.shape != grid.shape in streamplot when nx != ny by @scaomath in #10411
• Fix Index._repr_inline_() signature by @benbovy in #10415
• Clean up backend indexing some more by @dcherian in #10376
• Check and fix chararray string dimension names by @kmuehlbauer in #10395
• Fix reindex on Dataset from MultiIndex DataFrame with RuntimeError by @csernazs in #10381
• Apply new ruff rules by @DimitriPapadopoulos in #10428
• BUG: Fix display with nested NumPy arrays by @basnijholt in #10222
• DOC: Add cf_xarray to ecosystem page by @VeckoTheGecko in #10443
• Expose top-level xarray.indexes in init by @dcherian in #10435
• fix assert_equal for DataTree by @mathause in #10440
• Use a set comprehension by @DimitriPapadopoulos in #10453
• Redundant list comprehension can be replaced using generator by @DimitriPapadopoulos in #10454
• Simplify chained comparison between the operands by @DimitriPapadopoulos in #10447
• Unassigned string statement by @DimitriPapadopoulos in #10452
• Iterate the dictionary directly instead of calling .keys() by @DimitriPapadopoulos in #10451
• Unnecessary tuple/list literal by @DimitriPapadopoulos in #10450
• Unreachable code by @DimitriPapadopoulos in #10449
• Appending to dictionary immediately following its definition by @DimitriPapadopoulos in #10448
• Exceptions are overlapping by @DimitriPapadopoulos in #10446
• Enforce ruff/Pylint Warnings (PLW) by @DimitriPapadopoulos in #10458
• Update pre-commit hook pre-commit by @DimitriPapadopoulos in #10461
• Enforce ruff/Pylint Refactor rules (PLR) by @DimitriPapadopoulos in #10459
• Enforce ruff/Pylint Convention rules (PLC) by @DimitriPapadopoulos in #10460
• Switch to using the NumFOCUS Code of Conduct by @shoyer in #10432
• More Pylint issues by @DimitriPapadopoulos in #10463
• More f-strings, less format() by @DimitriPapadopoulos in #10474
• Enforce ruff/flake8-2020 rules (YTT) by @DimitriPapadopoulos in #10467
• assert_equal: ensure check_dim_order=False works for DataTree by @mathause in #10442
• Keyword argument passed twice by @DimitriPapadopoulos in #10473
• Branches of the if statement have similar implementation by @DimitriPapadopoulos in #10475
• Enforce ruff/flake8-simplify rules (SIM) by @DimitriPapadopoulos in #10462
• Apply assorted ruff preview rules by @DimitriPapadopoulos in #10465
• Revert "Enforce ruff/flake8-simplify rules (SIM)" by @max-sixty in #10476
• Fix RangeIndex slicing by @benbovy in #10471
• Update error message regex for latest Zarr by @dcherian in #10485
• update dependencies; drop python 3.10 by @dhruvak001 in #10438
• Fix critical np.timedelta64 encoding bugs by @spencerkclark in #10469
• Prevent pydap (dap4) to change string arrays to unicode type (testing). Fixed upstream by @Mikejmnez in #10482
• Downgrade zarr requests performance expectations for zarr 3.0.9 by @TomNicholas in #10491
• Use add_note() to annotate exceptions when encoding fails by @shoyer in #10464
• Check if zarr store supports consolidated metadata by @TomNicholas in #10457
• Fix Zarr 'number of requests' test by @ianhi in #10492
• Rename toplevel header from Contribute to Development by @scottyhq in #10472
• Release workflows: always check that the built dist is valid. by @dcherian in #10408
• Fix bug with ci/release_contributors.py script by @TomNicholas in #10494
• Release notes for v2025.07.0 by @TomNicholas in #10495

New Contributors

• @scaomath made their first contribution in #10411
• @csernazs made their first contribution in #10381
• @basnijholt made their first contribution in #10222
• @dhruvak001 made their first contribution in #10438

Full Changelog: v2025.06.1...v2025.07.0