National Weather Service United States Department of Commerce

Wind chills will drop as low as -15 degrees across parts of northeast Missouri and west central Illinois late tonight and Monday morning where a Cold Weather Advisory is in effect. Wear multiple layers of warm clothing and a hat and gloves if going out in the dangerous cold.
This week will start off frigid with widespread wind chills below 0 degrees Monday morning. Tuesday will start off slightly warmer before climbing into the 30s and low 40s in the afternoon.