The highest day temperature in January 2025 was 39°F. The lowest night temperature was -8°F. The average values for day and night temperatures during January were 23.6°F и 15.6°F respectivly.

The average sea surface temperature in January 2025 for Chicago was 33.0°F. The maximum and minimum values were 31.4°F and 36.2°F respectively.

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

Precipitation total in January for Chicago is 1.7 in. It makes january one of the least rainy months of the year.

The average wind speed in January is 12.0 mph. It makes January one of the most windy months of the year for Chicago.

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 Chicago in January is 3.5 hours.