Weather in December in Mt Vernon, Il

< December >
	Normal Max/ High Temperature	6°C (42°F)
	Average Temperature	0°C (33°F)
	Min/ Low Temperature	-5°C (24°F)
	Normal Precipitation	91mm (3.6in)
	Average Daylight per day	09h 34'
	Sun altitude at solar noon on the 21st day.	28.6°

The average temperature in Mt Vernon, Il in December is very cool at 0.4 °C (32.72 °F).
Afternoons can be cool with average high temperatures reaching 5.6 °C (42.1 °F).
Overnight temperatures are generally slightly cold with an average low of -4.7 °C (23.5 °F).
In December the variation/ range of diurnal mean temperatures is 10.3 °C (18.5 °F).
Precipitation averages for December are high with 90.9mm (3.6 in) recorded.
The shortest day is 9h 31' long and the longest day is 9h 42' long with an average length of 9h 34'.

Weather Trend Graph for December in Mt Vernon, Il, Usa

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