updated app.py file, updated graphs

app.py

@@ -19,8 +19,10 @@ def create_graphs():
     # Wind Speed over Time
     fig_wind = px.line(df, x='datetime', y='windspeed', title='Wind Speed Over Time')
 
+    df['year'] = df['datetime'].dt.year
     df['heat_index'] = df['temp'] + (0.55 - 0.55 * df['humidity'] / 100) * (df['temp'] - 58)
-    fig_heat = px.line(df.groupby('year')['heat_index'].mean(), title='Heat Index Over the Years')
+    fig_heat = px.line(df.groupby('year')['heat_index'].mean().reset_index(), x='year', y='heat_index', title='Heat Index Over the Years')
+
 
     # Return multiple graphs
     return fig_temp, fig_precip, fig_wind, fig_heat