Chicago is currently experiencing a significant temperature drop, with overnight lows expected to reach single digits. This cold snap follows a period of lake-effect snow that has impacted the region, particularly Northwest Indiana, where significant snowfall has been reported. The snow has left wet roadways that could lead to icy patches as temperatures continue to fall. On Sunday, the high temperature is expected to reach the upper 20s°F (-2°C), accompanied by windy conditions. The cold weather is a result of lake-effect snow patterns, which are common in this area during the winter months.