Two people were treated for hypothermia and frostbite overnight as the wind made it feel like –40 C in Ottawa.
In the first incident, a man in his 40s was found by the RCMP at the intersection of Bank and Wellington Streets, said the Ottawa Paramedic Service.
Later Friday night, bystanders found a man in his 20s suffering from hypothermia on the Rideau Canal near Carleton University.
He was "extricated" from the canal with the help of police and the National Capital Commission, paramedics said.
Both men were found in an "altered level of consciousness" and as of early Saturday morning were in hospital in stable condition, said paramedics.
Environment Canada issued an extreme cold warning for Ottawa on Friday. The wind chill made it feel like –40 C outside by 4 a.m. Saturday morning.
The city's public health unit has also issued a frostbite warning.