diff --git a/homeassistant/components/openweathermap/const.py b/homeassistant/components/openweathermap/const.py
index 607f223167f..74aa767e44d 100644
--- a/homeassistant/components/openweathermap/const.py
+++ b/homeassistant/components/openweathermap/const.py
@@ -139,7 +139,7 @@ LANGUAGES = [
 WEATHER_CODE_SUNNY_OR_CLEAR_NIGHT = 800
 CONDITION_CLASSES = {
     ATTR_CONDITION_CLOUDY: [803, 804],
-    ATTR_CONDITION_FOG: [701, 741],
+    ATTR_CONDITION_FOG: [701, 721, 741],
     ATTR_CONDITION_HAIL: [906],
     ATTR_CONDITION_LIGHTNING: [210, 211, 212, 221],
     ATTR_CONDITION_LIGHTNING_RAINY: [200, 201, 202, 230, 231, 232],
@@ -153,7 +153,6 @@ CONDITION_CLASSES = {
     ATTR_CONDITION_WINDY_VARIANT: [958, 959, 960, 961],
     ATTR_CONDITION_EXCEPTIONAL: [
         711,
-        721,
         731,
         751,
         761,