diff --git a/pysqm/plot.py b/pysqm/plot.py
index 379ee6dfbb97a5e2a287587326efae7ad4f16bb7..355753d4e3e86f1fadc1b92d81f4a3c96163d093 100644
--- a/pysqm/plot.py
+++ b/pysqm/plot.py
@@ -264,7 +264,7 @@ class SQMData(object):
             self.aftermidnight.label_dates=[]
 
 
-            if localdatetime.hour > 12:
+            if localdatetime.hour >= 12:
                 self.premidnight.utcdates.append(utcdatetime)
                 self.premidnight.localdates.append(localdatetime)
                 self.premidnight.temperatures.append(temperature)