I think you'll want your best winter coat the next few mornings! Very cold air will stay in place through mid-week, with wind chills in the mornings making it feel even more uncomfortable. It'll warm up a few degrees each day and end up close to average by late this week.
Modest inversions will build this week with increasing valley haze. A cold front will scour out the bad air this weekend, and possibly usher in some of the coldest air this season!
SALT LAKE CITY
Monday: Increasing clouds. Highs: Low 30s.
Monday Night: Mostly cloudy. Lows: Near 20.
ST. GEORGE
Monday: Sunny. Highs: Mid 40s.
Monday Night: Mostly clear. Lows: Mid 20s.