Release 2025.01.2

[kmuehlbauer]

What is your issue?

This issue tracks the release for allowing non-nanosecond datetimes/timedeltas (adapting to pandas) behaviour. We aimed for a release in January, so there quite some references to that release in the codebase/docs.

Must have:

• Enable passing a CFTimedeltaCoder to decode_timedelta #9966
• Fix infer_freq, check for subdtype "datetime64"/"timedelta64" #9999
• Revert "Use flox for grouped first, last (#9986)" #10001
• Use freq="D" instead of freq="d" in pd.timedelta_range #10004
• Doctest failing with numpy 2.1.3 #10005
• remove outdated type-ignores #10006
• cast numpy scalars to arrays in NamedArray.from_array #10008
• tbc

Nice to have:

• Preserve order of variables in combine_by_coords #9070
• Add FAQ answer about API stability & backwards compatibility #9855
• tbc

I'll start preparing release tomorrow. @pydata/xarray please add items as needed. Also raise concerns about the release date, if there are any.

[dcherian]

@aulemahal @Zeitsperre can you confirm that the xclim test suite is not failing after our switch to support non-nanosecond datetimes please?

[Zeitsperre]

@dcherian Thanks for checking in with us. We've been busy at a corporate conference our company held the past few days, but we'll give things a look today.

Right off the bat, our upstream xarray tests seem to be failing: Ouranosinc/xclim#2062

[kmuehlbauer]

@Zeitsperre The last run shows green, not? https://github.com/Ouranosinc/xclim/actions/workflows/upstream.yml

Update: There has been some groupby/flox changes in the last days which have been reverted yesterday IIRC. Good chance that this was the reason of the intermittent failing of your upstream CI. But anyway, please doublecheck, I do not want to release something which is known to break downstream. Thanks!

[aulemahal]

I confirm that the current main of xarray does not break xclim's test suite! It seems indeed, that the breaking two days ago was temporary.

[dcherian]

Amazing, thanks!

[kmuehlbauer]

@pydata/xarray All issues have been sorted out, no release blocker anymore. Thanks all 💯!

I've updated #10007. So this seems ready to fly. I've set the release date to January 31, so I'm going to get the release out tomorrow morning. If there are any last minute changes which should go in, please add these to the list above until January 31, 7 UTC. I'm about to release at 8-9 UTC, January 31. Thanks