Illinois climate guide

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Below are average maximum temperatures at popular destinations in Illinois for next month - January. Select a destination to see the climate guide for all months of the year.

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The climate guide for Illinois shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

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Metric (°C / mm)  |  Imperial (°F / inches)

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