diff --git a/models/models.go b/models/models.go
index d776de4..537f927 100644
--- a/models/models.go
+++ b/models/models.go
@@ -160,7 +160,7 @@ LIMIT 1
 const QueryAggregatedDataSQL = `
 SELECT 
     w.time_hour as timestamp,
-    MAX(r.hourly_rainfall) as rainfall,
+    IFNULL(MAX(r.hourly_rainfall), 0) as rainfall,
     AVG(w.temperature) as avg_temperature,
     AVG(w.humidity) as avg_humidity,
     AVG(w.wind_speed) as avg_wind_speed,