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

Publish test results cannot create check-runs with permissions: {} (403) Open

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

pydata/xarray#11594 · Opened Sep 18, 2026
xarray - dask `map_blocks` duplicates coordinate tasks across calls on the same object Open

bug needs triage

Difficulty 3/5 1-2 days Newbie friendliness 78/100

pydata/xarray#11588 · 2 comments · Opened Sep 14, 2026
Fix accessors docs build Open

bug needs triage

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

pydata/xarray#11584 · Opened Sep 12, 2026
`CachingFileManager` opens one file handle per `open_dataset()` call — could identical managers share a `FILE_CACHE` entry? Open

needs triage

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

pydata/xarray#11581 · 1 comment · Opened Sep 11, 2026
Weighted reductions drop orphaned dimensions Open

bug needs triage

Difficulty 3/5 1-2 days Newbie friendliness 68/100

pydata/xarray#11560 · 4 comments · Opened Sep 4, 2026
`max`, `min` and datetime `mean`/`median` raise on an empty dimension Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

pydata/xarray#11554 · 1 comment · Opened Sep 1, 2026
quantile fails on an empty dimension where other reductions return NaN Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

pydata/xarray#11549 · 2 comments · Opened Aug 29, 2026
Dask graph rewriting/ expression optimisation Open

enhancement

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

pydata/xarray#11542 · 4 comments · Opened Aug 24, 2026
`get_chunked_array_type` rejects two array classes handled by the same chunk manager Open

bug needs triage

Difficulty 3/5 1-2 days Newbie friendliness 75/100

pydata/xarray#11539 · 1 comment · Opened Aug 21, 2026
Benchmark compare last release: asv silently runs zero benchmarks since #10866 (py-rattler was added to environment-benchmark.yml but not environment.yml) Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

pydata/xarray#11533 · 1 comment · Opened Aug 19, 2026
xarray change subset of values of Dataset variable obtained from pandas DataFrame with pandas v3 Open

needs triage

Difficulty 3/5 1-2 days Newbie friendliness 50/100

pydata/xarray#11527 · Opened Aug 15, 2026
DataTree constructor error message says dict even though dict is not accepted Open

bug needs triage

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

pydata/xarray#11514 · Opened Aug 12, 2026
In open_zarr, decode_timedelta does not behave as documented Open

bug topic-zarr

Difficulty 3/5 1-2 days Newbie friendliness 62/100

pydata/xarray#11507 · 7 comments · Opened Aug 11, 2026
⚠️ Nightly upstream-dev CI failed ⚠️ Open

CI

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

pydata/xarray#11501 · 1 comment · Opened Aug 4, 2026
Construction of arrays with `object` dtype very slow when Pandas `future.infer_string` is enabled Open

bug topic-performance

Difficulty 3/5 1-2 days Newbie friendliness 55/100

pydata/xarray#11470 · 5 comments · Opened Jul 23, 2026
StringDType does not roundtrip through zarr Open

bug needs triage

Difficulty 3/5 1-2 days Newbie friendliness 56/100

pydata/xarray#11466 · 1 comment · 1 reaction · Opened Jul 21, 2026
Testing secting is user guide renders incorrectly Open

bug topic-documentation

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

pydata/xarray#11465 · 9 comments · Opened Jul 21, 2026
Unable to roundtrip sharded zarr Open

bug needs triage

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

pydata/xarray#11460 · Opened Jul 20, 2026
Documentation build failing in Windows Open

bug topic-documentation

Difficulty 3/5 1-2 days Newbie friendliness 58/100

pydata/xarray#11458 · 10 comments · Opened Jul 19, 2026
unstack is slow for regular data Open

bug topic-performance

Difficulty 4/5 3-5 days Newbie friendliness 55/100

pydata/xarray#11455 · 4 comments · Opened Jul 17, 2026
DataTree.children repr is inconsistent with DataTree.parent (rich HTML vs. flat nested text) Open

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

pydata/xarray#11453 · 2 comments · Opened Jul 14, 2026
REPR: Allow accessor to be included in the repr Open

enhancement

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

pydata/xarray#11451 · 1 comment · 1 reaction · Opened Jul 14, 2026
exception to indexed-coordinate only inheritance for `coordinates` encoding Open

enhancement

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

pydata/xarray#11441 · 1 comment · 1 reaction · Opened Jul 7, 2026
resolving the nightly version of `numcodecs` fails Open

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

pydata/xarray#11437 · 1 comment · Opened Jul 5, 2026
a proposal to simplify encoding for zarr data Open

topic-zarr

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

pydata/xarray#11431 · 8 comments · 1 reaction · Opened Jul 2, 2026
Allow data variables paths instead of just names in xarray.concat when passing DataTrees Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 62/100

pydata/xarray#11427 · 1 comment · Opened Jun 30, 2026
np.linalg.pinv of a DataArray results in mismatched coordinates Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

pydata/xarray#11396 · 3 comments · Opened Jun 22, 2026
head's up about private zarr-python API usage Open

topic-zarr

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

pydata/xarray#11378 · Opened Jun 7, 2026
Documentation error for DataArray.pad Open

bug needs triage

Difficulty 1/5 1-3 hours Newbie friendliness 82/100

pydata/xarray#11373 · 2 comments · Opened Jun 4, 2026
upstream type checking with a nightly version of `numpy` Open

CI topic-typing

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

pydata/xarray#11371 · 1 comment · Opened Jun 3, 2026
Cannot reindex onto a stacked MultiIndex via indexers — only reindex_like works Open

Difficulty 4/5 3-5 days Newbie friendliness 58/100

pydata/xarray#11368 · Opened Jun 1, 2026
Load and build indices lazily Open

enhancement topic-indexing

Difficulty 5/5 Over a week Newbie friendliness 38/100

pydata/xarray#11367 · 5 comments · Opened Jun 1, 2026
add `use_zarr_fill_value_as_mask` in `open_datatree` for Zarr Stores Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

pydata/xarray#11361 · Opened May 27, 2026
Dataset.map can't update data_var attrs Open

bug contrib-help-wanted

Difficulty 3/5 1-2 days Newbie friendliness 64/100

pydata/xarray#11356 · 1 reaction · Opened May 26, 2026
Corrupted data when Xarray writes to Zarr Datetime64 dtype Open

bug needs triage

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

pydata/xarray#11350 · 2 comments · Opened May 22, 2026
Load failure (in rain to flood toolkit) Open

bug contrib-good-first-issue

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

pydata/xarray#11344 · 2 comments · Opened May 20, 2026
xarray interp with method="cubic" fails for time/lon/lat interpolation Open

needs mcve needs triage

Difficulty 4/5 3-5 days Newbie friendliness 42/100

pydata/xarray#11342 · 2 comments · Opened May 15, 2026
cumulate+argmax uses padded index instead of absolute index Open

bug needs triage

Difficulty 3/5 1-2 days Newbie friendliness 55/100

pydata/xarray#11336 · 1 comment · Opened May 13, 2026
Extend `FillValueCoder.decode` to accept JSON-native scalars for the zarr backend Open

enhancement topic-zarr

Difficulty 3/5 1-2 days Newbie friendliness 68/100

pydata/xarray#11332 · 2 comments · 2 reactions · Opened May 11, 2026
FutureCancelledError (lost dependencies) during `dask.compute` with `optimize_graph=True` when chaining Dataset.assign Open

bug needs triage

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

pydata/xarray#11329 · 1 comment · Opened May 10, 2026
2026.4.0 breaks pickling with backends.scipy_ Open

bug contrib-good-first-issue regression topic-backends

Difficulty 3/5 1-2 days Newbie friendliness 63/100

pydata/xarray#11323 · 6 comments · Opened May 6, 2026
concat fails due to StringDtype introduced by pd.Index Open

bug needs triage

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

pydata/xarray#11317 · 1 comment · Opened Apr 29, 2026
Cannot call .chunk('auto') on DataTree. Open

bug needs triage

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

pydata/xarray#11315 · 1 comment · Opened Apr 29, 2026
`_decode_cf_datetime_dtype` triggers 2 store reads per time variable — expensive on remote stores Open

Difficulty 4/5 3-5 days Newbie friendliness 50/100

pydata/xarray#11303 · 3 comments · Opened Apr 17, 2026
`.idxmax()` fails if coordinates are intervals Open

bug needs triage

Difficulty 3/5 1-2 days Newbie friendliness 68/100

pydata/xarray#11300 · Opened Apr 16, 2026
Codec-based alternative to attribute-based scale-offset encoding Open

needs triage

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

pydata/xarray#11280 · 6 comments · 1 reaction · Opened Apr 2, 2026
Units and calendar attributes of time_bnds are dropped by to_netcdf Open

plan to close topic-CF conventions

Difficulty 3/5 1-2 days Newbie friendliness 58/100

pydata/xarray#11275 · 3 comments · Opened Apr 1, 2026
Add CI to ensure all `requires_` tests are run at least once Open

CI enhancement topic-testing

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

pydata/xarray#11273 · 4 comments · Opened Mar 31, 2026
No way to specify compat behaviour for xr.apply_ufunc and ops that use it; binary arithmetic ufuncs don't use arithmetic_compat. Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 42/100

pydata/xarray#11272 · 2 comments · Opened Mar 30, 2026
Inconsistent and unexpected results when grouping by more than one coordinate Open

API design bug topic-groupby

Difficulty 4/5 3-5 days Newbie friendliness 55/100

pydata/xarray#11264 · 3 comments · Opened Mar 26, 2026

pydata/xarray

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