Freeze warnings are in effect this morning as residents wake up to the coldest air of the season.
The National Weather Service has issued a freeze warning until 9 a.m. for Hartford, Middlesex, New Haven, Litchfield, Tolland, New London and Windham counties.
Among the communities with sub-freezing temperatures this morning are Danbury, Mansfield, Meriden and Torrington.
Frost advisories have been issued for southern Fairfield, New Haven, Middlesex and New London counties until 9 a.m.
Sun will move in and temperatures will rise into the 50s. Then there will be periods of rain tonight through Friday.