Women and children play in the water fountains at the Place des Arts in Montreal on a hot July 3, 2018.
An area of high pressure is going to keep cool air locked in Canada for most of the week, AccuWeather reports.
He said the Montreal heat exposure victims were between 50 and 80.
"We ask people to take the patients out of their rooms at least two times a day for two hours", she said.
Twelve of the dead were reported in the eastern province´s capital Montreal, said regional public health director Mylene Drouin. The causes of the deaths remain to be confirmed by a coroner.More news: Complete list of Fourth of July celebrations around San Antonio
As many as 16 people have died in Quebec from complications related to the extended period of hot and humid weather hitting much of Eastern and Central Canada.
"Extreme heat affects everyone".
An emergency coordination centre has been activated to supervise those measures and Montreal Mayor Valerie Plante has called on Montrealers to show solidarity with at-risk people. Cool down is expected by Friday with the passage of a cold front.
An extended heat warning issued by the city's medical officer of health on Sunday remains in effect. The previous record was 35.
The new system is a partnership between Environment and Climate Change Canada, Health Canada and the Nova Scotia Department of Health and Wellness. Temperatures in Canada's largest city have topped 30 degrees every day since Friday.More news: Hot Dog Contest Odds: Joey Chestnut Favorite On Fourth Of July
Dr. Stang says he doesn't fear having more frequent warnings will make people pay less attention to them.
But relief is coming, however slowly.
Friday's forecast is for a mix of sun and cloud, a 30 per cent chance of showers and a high of just 27 C and a low of 13 C that will have us all throwing open our windows.
Even those not specifically at risk are encouraged to stay inside or in the shade, and to limit outdoor activity in the heat.More news: Russian couple divorce over Ronaldo Vs Messi battle