O'Fallon MO weather

 Latitude N 38° 50' 20"    Longitude W 90° 43' 43"    Elevation 550 ft

Records began on 05 September 2009. Here are the extremes recorded since then.

Records Since 05 September 2009
Temperature and Humidity
Highest Temperature 107.3 °F at 5:00 PM on 28 June 2012
Lowest Temperature -8.8 °F at 7:44 AM on 06 January 2014
Highest Dew Point 84.3 °F at 3:13 PM on 12 July 2011
Lowest Dew Point -20.8 °F at 7:22 AM on 30 January 2019
Highest Apparent Temperature 115.1 °F at 6:29 PM on 02 August 2011
Lowest Apparent Temperature -21.9 °F at 8:31 AM on 06 January 2014
Lowest Wind Chill Temperature -33.5 °F at 8:26 AM on 06 January 2014
Highest Heat Index 124.1 °F at 6:28 PM on 02 August 2011
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
Highest Humidity 100 % at 7:41 AM on 11 September 2011
Lowest Humidity 14 % at 2:30 PM on 08 March 2020
Highest Daily Range 78.6 °F on 14 May 2012
Lowest Daily Range 0.3 °F on 09 November 2012
Rainfall
Highest Rain Rate 82.29 in/hr at 10:24 AM on 28 July 2022
Highest Hourly Rainfall 14.16 in at 10:16 AM on 28 July 2022
Highest Daily Rainfall 24.41 in on 28 July 2022
Highest Monthly Rainfall 101.92 in July 2022
Longest Dry Period 25 days to 07 September 2013
Longest Wet Period 9 days to 28 May 2013
Wind
Highest Wind Gust 58.0 mph at 5:00 PM on 18 June 2012
Highest Wind Speed Average 26.0 mph at 4:57 PM on 20 February 2014
Highest Daily Wind Run 339.0 miles on 20 December 2012
Pressure
Lowest Pressure (sl) 29.027 in at 3:30 AM on 26 October 2010
Highest Pressure (sl) 30.984 in at 4:27 PM on 07 January 2015
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