Fix falsey comparisons in NWS weather (#44486)

homeassistant/components/nws/weather.py

@@ -161,7 +161,7 @@ class NWSWeather(WeatherEntity):
         temp_c = None
         if self.observation:
             temp_c = self.observation.get("temperature")
-        if temp_c:
+        if temp_c is not None:
             return convert_temperature(temp_c, TEMP_CELSIUS, TEMP_FAHRENHEIT)
         return None
 
@@ -273,7 +273,7 @@ class NWSWeather(WeatherEntity):
 
             data[ATTR_FORECAST_WIND_BEARING] = forecast_entry.get("windBearing")
             wind_speed = forecast_entry.get("windSpeedAvg")
-            if wind_speed:
+            if wind_speed is not None:
                 if self.is_metric:
                     data[ATTR_FORECAST_WIND_SPEED] = round(
                         convert_distance(wind_speed, LENGTH_MILES, LENGTH_KILOMETERS)