No interpolation on dayofyear

CHANGELOG.rst

@@ -24,16 +24,16 @@ v0.55.0 (2025-02-17)
 --------------------
 Contributors to this version: Juliette Lavoie (:user:`juliettelavoie`), Trevor James Smith (:user:`Zeitsperre`), Sascha Hofmann (:user:`saschahofmann`), Pascal Bourgault (:user:`aulemahal`), Éric Dupuis (:user:`coxipi`), Baptiste Hamon (:user:`baptistehamon`), Sarah Gammon (:user:`SarahG-579462`).
 
-Breaking changes
-^^^^^^^^^^^^^^^^
-* Missing value method "WMO" was modified to remove the criterion that the timeseries needs to be continuous (without holes). (:pull:`2058`).
-
 Announcements
 ^^^^^^^^^^^^^
 * `xclim` now officially supports Python 3.13 (using `numba` v0.61.0). (:issue:`2022`, :pull:`2054`).
 * `xclim` version 0.55.0 will be the last version to support Python 3.10. The next version will require Python 3.11 or higher. (:pull:`2054`).
 * `xclim.sdba` is in the process of being split into a separate package (`xsdba <https://github.com/Ouranosinc/xsdba>`_) to help with the maintenance of the codebase as well as better support new SDBA functionality. Feature additions to the `xclim.sdba` module will no longer be accepted and should be made instead to `xsdba`. The developers aim to ensure a high level of interoperability between `xclim` and `xsdba` so that users are minimally impacted; A migration guide will be made available in a future release. (:issue:`1948`, :issue:`2074`, :pull:`2073`).
 
+Breaking changes
+^^^^^^^^^^^^^^^^
+* Missing value method "WMO" was modified to remove the criterion that the timeseries needs to be continuous (without holes). (:pull:`2058`).
+
 New indicators
 ^^^^^^^^^^^^^^
 * Added ``xclim.land.holiday_snow_days`` to compute the number of days with snow on the ground during holidays ("Christmas Days"). (:issue:`2029`, :pull:`2030`).
@@ -54,6 +54,7 @@ New features and enhancements
 Bug fixes
 ^^^^^^^^^
 * Fixed a bug in ``xclim.sdba.Grouper.get_index`` that didn't correctly interpolate seasonal values (:issue:`2014`, :pull:`2019`).
+* When using a dayofyear grouping, `sdba.utils.interp_on_quantiles` will not interpolate on the dayofyear dimension. (:pull:`2068`).
 * Fixed a bug where ``xclim.indicators.atmos.potential_evapotranspiration`` would return wrong results when `hurs` was provided in `%` (:pull:`2067`).
 * Fixed the default "op" argument of ``xclim.atmos.growing_season_end`` (:issue:`2056`, :pull:`2080`).
 * Removed the useless "thresh" argument from ``xclim.atmos.precip_accumulation`` (:issue:`1763`, :pull:`2080`).

src/xclim/sdba/utils.py

@@ -464,11 +464,14 @@ def interp_on_quantiles(
     dim = group.dim
     prop = group.prop
 
-    if prop == "group":
-        if "group" in xq.dims:
-            xq = xq.squeeze("group", drop=True)
-        if "group" in yq.dims:
-            yq = yq.squeeze("group", drop=True)
+    # dayofyear case does not require interpolation
+    # on the dayofyear dimension
+    if prop in ["group", "dayofyear"]:
+        if prop == "group":
+            if "group" in xq.dims:
+                xq = xq.squeeze("group", drop=True)
+            if "group" in yq.dims:
+                yq = yq.squeeze("group", drop=True)
 
         out = xr.apply_ufunc(
             _interp_on_quantiles_1D,