New record low temperatures were set across the province, including in Sarnia, on a frigid Family Day.
Environment Canada meteorologist Geoff Coulson says the mercury at Chris Hadfield Airport fell to -28.3 C (-19 F) at 7am Monday.
He says that shattered the previous record of -21.2 C set in 2004.
Coulson says long range forecast models indicate colder than normal weather for the rest of this month and into March.
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In Waterloo Region at 7am Monday an unofficial all time record low of -34.1 C (-29 F) was recorded.