diff --git a/Weather/Service/MessageHandler.cs b/Weather/Service/MessageHandler.cs
index 7d8cf2f..5213671 100644
--- a/Weather/Service/MessageHandler.cs
+++ b/Weather/Service/MessageHandler.cs
@@ -97,7 +97,7 @@ namespace ChrisKaczor.HomeMonitor.Weather.Service
 
                 _database.StoreWeatherData(weatherMessage);
 
-                weatherMessage.Rain = _database.GetReadingValueSum(WeatherValueType.Rain, weatherMessage.Timestamp.AddHours(1), weatherMessage.Timestamp).Result;
+                weatherMessage.Rain = _database.GetReadingValueSum(WeatherValueType.Rain, weatherMessage.Timestamp.AddHours(-1), weatherMessage.Timestamp).Result;
 
                 if (_hubConnection == null)
                     return;
@@ -127,4 +127,4 @@ namespace ChrisKaczor.HomeMonitor.Weather.Service
             Console.WriteLine(message);
         }
     }
-}
\ No newline at end of file
+}