diff --git a/homeassistant/components/ambient_station/__init__.py b/homeassistant/components/ambient_station/__init__.py
index f68ae3df1144ac..364e5b2abb6649 100644
--- a/homeassistant/components/ambient_station/__init__.py
+++ b/homeassistant/components/ambient_station/__init__.py
@@ -148,6 +148,7 @@ def on_data(data: dict) -> None:
             """Define a handler to fire when the data is received."""
             mac = data["macAddress"]
 
+            # If data has not changed, don't update:
             if data == self.stations[mac][ATTR_LAST_DATA]:
                 return
 
@@ -228,33 +229,23 @@ def __init__(
         self._mac_address = mac_address
         self.entity_description = description
 
+    @callback
+    def _async_update(self) -> None:
+        """Update the state."""
+        last_data = self._ambient.stations[self._mac_address][ATTR_LAST_DATA]
+        key = self.entity_description.key
+        available_key = TYPE_SOLARRADIATION if key == TYPE_SOLARRADIATION_LX else key
+        self._attr_available = last_data[available_key] is not None
+        self.update_from_latest_data()
+        self.async_write_ha_state()
+
     async def async_added_to_hass(self) -> None:
         """Register callbacks."""
-
-        @callback
-        def update() -> None:
-            """Update the state."""
-            if self.entity_description.key == TYPE_SOLARRADIATION_LX:
-                self._attr_available = (
-                    self._ambient.stations[self._mac_address][ATTR_LAST_DATA][
-                        TYPE_SOLARRADIATION
-                    ]
-                    is not None
-                )
-            else:
-                self._attr_available = (
-                    self._ambient.stations[self._mac_address][ATTR_LAST_DATA][
-                        self.entity_description.key
-                    ]
-                    is not None
-                )
-
-            self.update_from_latest_data()
-            self.async_write_ha_state()
-
         self.async_on_remove(
             async_dispatcher_connect(
-                self.hass, f"ambient_station_data_update_{self._mac_address}", update
+                self.hass,
+                f"ambient_station_data_update_{self._mac_address}",
+                self._async_update,
             )
         )
 
diff --git a/homeassistant/components/ambient_station/binary_sensor.py b/homeassistant/components/ambient_station/binary_sensor.py
index 8876c1a5c627cc..ca32f16c758ceb 100644
--- a/homeassistant/components/ambient_station/binary_sensor.py
+++ b/homeassistant/components/ambient_station/binary_sensor.py
@@ -409,9 +409,6 @@ class AmbientWeatherBinarySensor(AmbientWeatherEntity, BinarySensorEntity):
     @callback
     def update_from_latest_data(self) -> None:
         """Fetch new state data for the entity."""
-        self._attr_is_on = (
-            self._ambient.stations[self._mac_address][ATTR_LAST_DATA][
-                self.entity_description.key
-            ]
-            == self.entity_description.on_state
-        )
+        description = self.entity_description
+        last_data = self._ambient.stations[self._mac_address][ATTR_LAST_DATA]
+        self._attr_is_on = last_data[description.key] == description.on_state
diff --git a/homeassistant/components/ambient_station/sensor.py b/homeassistant/components/ambient_station/sensor.py
index 0fc6e7643dbc1a..8bdc66133d6854 100644
--- a/homeassistant/components/ambient_station/sensor.py
+++ b/homeassistant/components/ambient_station/sensor.py
@@ -694,11 +694,9 @@ def __init__(
     @callback
     def update_from_latest_data(self) -> None:
         """Fetch new state data for the sensor."""
-        raw = self._ambient.stations[self._mac_address][ATTR_LAST_DATA][
-            self.entity_description.key
-        ]
-
-        if self.entity_description.key == TYPE_LASTRAIN:
+        key = self.entity_description.key
+        raw = self._ambient.stations[self._mac_address][ATTR_LAST_DATA][key]
+        if key == TYPE_LASTRAIN:
             self._attr_native_value = datetime.strptime(raw, "%Y-%m-%dT%H:%M:%S.%f%z")
         else:
             self._attr_native_value = raw