Chicago, Illinois, United States in January

January-2°C average high

January has some of the coolest average daytime highs of the year, so pack for fresher conditions.

Warmest monthsMay to September

This stretch sets the upper range for average daytime heat.

January44mm average rain

January sits on the drier side of Chicago's year, which helps with sightseeing and transfers.

Driest monthsJanuary to February and October

This is the drier part of the year, when outdoor plans usually need less weather flexibility.

January4.3 hours average sun

January is below Chicago's yearly sunshine average, so bright-day planning is less reliable than in peak months.

Brightest monthsMay to August

This stretch has the strongest sunshine in the monthly averages.

January3°C average sea

January is one of the coolest sea months, so the water may feel fresher than in peak months.

Warmest seaJuly to September

Sea temperatures are usually near 21°C in this stretch, so swimming comfort is at its strongest.

January26 weather score

January is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.

Best weather monthsJune to August

These months have the strongest weather score in the monthly averages.