The highest day temperature in December 2025 was 54°F. The lowest night temperature was -4°F. The average values for day and night temperatures during December were 29.3°F и 20.7°F respectivly.

The average sea surface temperature in December 2025 for Oak Park was 37.6°F. The maximum and minimum values were 33.2°F and 44.8°F respectively.

Most of the days in December are gloomy but you can also expect sunny days.

Precipitation total in December for Oak Park is 0.6 in. It makes december one of the least rainy months of the year.

The average wind speed in December is 8.2 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Oak Park in December is 3.9 hours.