April showers bring May flowers and apparently May brings frost.
Environment Canada has issued a frost advisory for much of southern Ontario. It stretches from Windsor east to Durham Region. The advisory covers the GTHA and the city of Toronto as well.
EC says an unseasonably cold arctic air mass has become entrenched over Southern Ontario.
Temperatures Sunday night are expected to plunge to near or a couple degrees below the zero degree mark in most areas under partly cloudy to mainly clear skies and diminishing winds. Hence widespread frost is likely across most of of the region overnight into Monday morning.
Frost-sensitive plants and trees should be protected or brought indoors by this evening.
Temperatures will slowly rise above the freezing mark Monday morning.
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.