diff --git a/homeassistant/components/number/__init__.py b/homeassistant/components/number/__init__.py
index dfd14f5257b..c8fd3c27972 100644
--- a/homeassistant/components/number/__init__.py
+++ b/homeassistant/components/number/__init__.py
@@ -202,8 +202,8 @@ class NumberDeviceClass(StrEnum):
     PRECIPITATION = "precipitation"
     """Precipitation.
 
-    Unit of measurement:
-    - SI / metric: `mm`
+    Unit of measurement: UnitOfPrecipitationDepth
+    - SI / metric: `cm`, `mm`
     - USCS / imperial: `in`
     """
 
diff --git a/homeassistant/components/sensor/__init__.py b/homeassistant/components/sensor/__init__.py
index e4bfca192ff..3489bc3f895 100644
--- a/homeassistant/components/sensor/__init__.py
+++ b/homeassistant/components/sensor/__init__.py
@@ -266,8 +266,8 @@ class SensorDeviceClass(StrEnum):
     PRECIPITATION = "precipitation"
     """Precipitation.
 
-    Unit of measurement:
-    - SI / metric: `mm`
+    Unit of measurement: UnitOfPrecipitationDepth
+    - SI / metric: `cm`, `mm`
     - USCS / imperial: `in`
     """
 
diff --git a/homeassistant/const.py b/homeassistant/const.py
index 7de72571cff..127faf93d6f 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -817,6 +817,9 @@ class UnitOfPrecipitationDepth(StrEnum):
     MILLIMETERS = "mm"
     """Derived from mm³/mm²"""
 
+    CENTIMETERS = "cm"
+    """Derived from cm³/cm²"""
+
 
 # Precipitation units
 PRECIPITATION_INCHES: Final = "in"