LaSalle
Illinois, USA
Long-term weather forecast
Long-term weather forecast
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December weather forecast and Climate
LaSalle, IL

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  • The average high temperature in December: 34°F

The warmest month (with the highest average high temperature) is July (85°F).
The month with the lowest average high temperature is January (30°F).

  • The average low temperature in December: 18°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (14°F).

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