Cold air made a comeback Monday morning as temperatures fell into the 20s and 30s.
Expect to see some frost Monday morning as Environment Canada issued a frost advisory on Sunday for most of southern Ontario, including Waterloo region, northern and southern Wellington County.
The freeze advisory is mainly for areas away from the lakeshore in Chautauqua County, at higher elevations.
Take preventative measures to protect frost-sensitive plants and trees.More news: Voice Is the Next Interface: Harman Kardon's Invoke Uses Cortana
The breeze calms down for Tuesday under mostly sunny skies.
The National Weather Service has issued a frost advisory for most of West Virginia, Kentucky and OH early Monday.
Meteorologist Erik Zarnitz said patchy frost is likely.
"Frost advisories are issued when temperatures are expected to reach the freezing mark during the growing season, leading to potential damage and destruction to plants and crops", the release adds.More news: Syria violence kills 4, wounds child despite safe zones
Afternoon highs will stay unseasonably cool in the mid-Atlantic despite appearances of the strong May sun.
The National Weather Service in Grand Rapids says temperatures will fall to 25 to 30 degrees tonight.
The average date of the last frost is around the beginning of May along the coast and after the middle of the month farther inland across the higher terrain.More news: Fan banned from Fenway Park after using racial slur