December weather forecast and climate
Lanark, IL

What is the temperature in December in Lanark?

The average high-temperature, in December, is 34°F (1.1°C), while the average low-temperature is 14°F (-10°C).

How much does it rain in Lanark in December?

During December, Lanark regularly aggregates up to 2" (51.3mm) of precipitation.
Average temperature in December - Lanark, IL
  • Average high temperature in December: 34°F

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (28°F).

  • Average low temperature in December: 14°F

The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is January (7°F).

Average rainfall in December - Lanark, IL
  • Average rainfall in December: 2"

The wettest month (with the highest rainfall) is June (4.8").
The driest month (with the lowest rainfall) is January (1.4").

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

The month with the longest days is June (Average daylight: 15.2h).
The month with shortest days is December (Average daylight: 9.2h).