December weather forecast
LaSalle, IL

Weather in December

The first month of the winter, December, is also a wintry month in LaSalle, Illinois, with average temperature ranging between max 34°F (1.1°C) and min 18°F (-7.8°C).

Temperature

In December, the average high-temperature declines considerably, from a frosty 48.9°F (9.4°C) in November, to a cold 34°F (1.1°C). In December, in LaSalle, the average low-temperature is 18°F (-7.8°C).

Daylight

December has the shortest days of the year, with an average of 9.2h of daylight.
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FAQ

What is the month with the shortest days in LaSalle?

December has the shortest days of the year, with an average of 9.2h of daylight.

How many hours of daylight does LaSalle have in December?

In December, the average length of the day is 9.2h.

Average temperature in December
LaSalle, IL

Average temperature in December - LaSalle, IL
  • 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).

  • 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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Average daylight in December
LaSalle, IL

Average daylight in December - LaSalle, IL
  • Average daylight in December: 9.2h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.2h).

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