2:01 PM EDT Friday 22 May 2015
Frost Advisory in effect for:
- Ottawa North - Kanata - Orléans
- Ottawa South - Richmond - Metcalfe
Wide spread frost is expected. Under clear skies and calm winds, ground temperatures overnight and early Saturday morning are expected to be at or a few degrees below freezing. The exception is for areas very close to the Great Lakes where temperatures will remain a couple of degrees above freezing.
Take preventative measures to protect frost-sensitive plants and trees.
Weather Advisories for Frost 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.
Map courtesy of Accuweather. I think Southern Ontario will be hit harder than implied by this map, eg Guelph and area will be hitting neg values.