O'Fallon, MO Weather Records Since April 2005

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Temperature    
Highest Temperature 107.3 °F at 5:00 PM on 28 June 2012
Highest Heat Index 124.1 °F at 6:28 PM on 02 August 2011
Lowest Temperature -8.8 °F at 7:44 AM on 06 January 2014
Lowest Windchill -33.5 °F at 8:26 AM on 06 January 2014
Highest Minimum 83.0 °F at 6:09 AM on 24 July 2012
Lowest Maximum 1.9 °F at 12:00 AM on 06 January 2014
Rainfall    
Highest Rain Rate 18.00 in/hr at 8:35 AM on 16 June 2011
Highest Hourly Rain 3.04 in at 3:35 PM on 10 June 2014
Highest Daily Rain 3.75 in on 27 December 2015
Highest Monthly Rain 12.03 in October 2009
Wind    
Highest Gust 58.0 mph at 5:00 PM on 18 June 2012
Highest Average 26.0 mph at 4:57 PM on 20 February 2014
Pressure    
Highest Pressure 30.984 in at 4:27 PM on 07 January 2015
Lowest Pressure 29.027 in at 3:30 AM on 26 October 2010
Page Updated 4/30/2017 1:35:00 PM