Temperatures are expected to drop significantly as a mass of cold air moves into certain regions. This cold air will bring overnight lows into the 50s and even 40s in some areas. Daytime temperatures will also be affected, with highs reaching only the mid-70s.

Further details about the weather pattern are available from the CNN Weather app. The cold air is part of a larger shift in the weather, marking a change from summer conditions.

A specific city, Chicago, will experience temperatures in the 70s during the day, but will drop to the upper 50s at night as the cold air persists.