diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 1fb325df6..868e9acc7 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -52,6 +52,7 @@ Internal changes
     * Added formatting for `Markdown` files.
     * Added the `bugbear`, `pyupgrade` checks to the `ruff` formatter.
     * Adjusted `mypy` checks to be more standardized.
+* Renamed annual deprecated frequency alias `"A"` to `"Y"` (:pull:`1930`).
 
 CI changes
 ^^^^^^^^^^
diff --git a/tests/test_indicators.py b/tests/test_indicators.py
index 04685218d..997d2719b 100644
--- a/tests/test_indicators.py
+++ b/tests/test_indicators.py
@@ -884,6 +884,6 @@ def test_freq_doc():
     from xclim import atmos
 
     doc = atmos.latitude_temperature_index.__doc__
-    allowed_periods = ["A"]
+    allowed_periods = ["Y"]
     exp = f"Restricted to frequencies equivalent to one of {allowed_periods}"
     assert exp in doc
diff --git a/xclim/core/indicator.py b/xclim/core/indicator.py
index 7c1f0ddac..97242c692 100644
--- a/xclim/core/indicator.py
+++ b/xclim/core/indicator.py
@@ -1495,7 +1495,7 @@ class ResamplingIndicator(CheckMissingIndicator):
         If None, this will be determined by the global configuration.
     allowed_periods : Sequence[str], optional
         A list of allowed periods, i.e. base parts of the `freq` parameter.
-        For example, indicators meant to be computed annually only will have `allowed_periods=["A"]`.
+        For example, indicators meant to be computed annually only will have `allowed_periods=["Y"]`.
         `None` means "any period" or that the indicator doesn't take a `freq` argument.
     """
 
diff --git a/xclim/core/utils.py b/xclim/core/utils.py
index fcca4c3ef..5dff76c31 100644
--- a/xclim/core/utils.py
+++ b/xclim/core/utils.py
@@ -577,7 +577,6 @@ def adapt_clix_meta_yaml(  # noqa: C901
     """Read in a clix-meta yaml representation and refactor it to fit xclim's yaml specifications."""
     from ..indices import generic  # pylint: disable=import-outside-toplevel
 
-    # freq_names = {"annual": "A", "seasonal": "Q", "monthly": "M", "weekly": "W"}
     freq_defs = {"annual": "YS", "seasonal": "QS-DEC", "monthly": "MS", "weekly": "W"}
 
     if isinstance(raw, os.PathLike):
diff --git a/xclim/indicators/atmos/_temperature.py b/xclim/indicators/atmos/_temperature.py
index 661169468..d1efd311a 100644
--- a/xclim/indicators/atmos/_temperature.py
+++ b/xclim/indicators/atmos/_temperature.py
@@ -1383,7 +1383,7 @@ def cfcheck(self, tas, snd=None):
     "Mean temperature of warmest month multiplied by the difference of latitude factor coefficient minus latitude. "
     "Metric originally published in Jackson, D. I., & Cherry, N. J. (1988).",
     cell_methods="",
-    allowed_periods=["A"],
+    allowed_periods=["Y"],
     var_name="lti",
     compute=indices.latitude_temperature_index,
     parameters={"lat": {"kind": InputKind.VARIABLE}, "lat_factor": 60},
@@ -1419,7 +1419,7 @@ def cfcheck(self, tas, snd=None):
     "Botanical Gardens (ANBG) classification scheme divides categories into 5-degree Celsius zones, starting from -15 "
     "degrees Celsius and ending at 20 degrees Celsius.",
     cell_methods="",
-    allowed_periods=["A"],
+    allowed_periods=["Y"],
     var_name="hz",
     compute=indices.hardiness_zones,
     parameters={"method": "anbg"},
@@ -1440,7 +1440,7 @@ def cfcheck(self, tas, snd=None):
     "scheme divides categories into 10 degree Fahrenheit zones, with 5-degree Fahrenheit half-zones, "
     "starting from -65 degrees Fahrenheit and ending at 65 degrees Fahrenheit.",
     cell_methods="",
-    allowed_periods=["A"],
+    allowed_periods=["Y"],
     var_name="hz",
     compute=indices.hardiness_zones,
     parameters={"method": "usda"},