diff --git a/pvdeg/design.py b/pvdeg/design.py
index af462848..754d2c4e 100644
--- a/pvdeg/design.py
+++ b/pvdeg/design.py
@@ -48,7 +48,7 @@ def edge_seal_width(weather_df, meta, k=None, years=25, from_dew_point=False):
     Parameters
     ----------
     weather_df : pd.DataFrame
-        must be datetime indexed and contain at least temp_air, Dew Point
+        must be datetime indexed and contain at least temp_air, temp_dew
     meta : dict
         location meta-data (from weather file)
     k: float
@@ -58,7 +58,7 @@ def edge_seal_width(weather_df, meta, k=None, years=25, from_dew_point=False):
     years : integer, default = 25
         Integer number of years under water ingress
     from_dew_point : boolean, optional
-        If true, will compute the edge seal width from Dew Point instead of dry bulb air temp
+        If true, will compute the edge seal width from temp_dew instead of dry bulb air temp
 
     Returns
     ----------
diff --git a/pvdeg/humidity.py b/pvdeg/humidity.py
index 44d3dc21..2372f649 100644
--- a/pvdeg/humidity.py
+++ b/pvdeg/humidity.py
@@ -30,7 +30,7 @@ def _ambient(weather_df):
     -----------
     weather_df : pd.DataFrame
         Datetime-indexed weather dataframe which contains (at minimum) Ambient temperature
-        ('temp_air') and dew point ('Dew Point') in units [C]
+        ('temp_air') and dew point ('temp_dew') in units [C]
 
     Returns:
     --------
@@ -39,7 +39,8 @@ def _ambient(weather_df):
         ambient relative humidity [%]
     """
     temp_air = weather_df["temp_air"]
-    dew_point = weather_df["Dew Point"]
+    # "Dew Point" fallback handles key-name bug in pvlib < v0.10.3.
+    dew_point = weather_df.get("temp_dew", weather_df.get("Dew Point"))
 
     num = np.exp(17.625 * dew_point / (243.04 + dew_point))
     den = np.exp(17.625 * temp_air / (243.04 + temp_air))