Average temperatures, rainfall and packing tips for Chicago, United States in January
January in Chicago is typically freezing, with average daytime highs around -1°C and nights near -6°C. It is usually the coldest month of the year in Chicago.
January is one of the wetter months in Chicago, with around 107 mm of rain - plan around showers.
If your dates are flexible, the most comfortable months in Chicago are usually May, June, July, August, September and October.
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In January, Chicago averages a daytime high of about -1°C and a night-time low of around -6°C, based on recent historical data. That makes it the coldest month of the year there.
January is one of the wetter months in Chicago, with around 107 mm of rain - plan around showers.
January is cold in Chicago. City sightseeing works fine if you dress for it, but pack properly and expect short days. If your dates are flexible, the most comfortable months in Chicago are usually May, June, July, August, September and October.