Literature review, consideration of the impact of heat islands on vulnerable populations. Consideration of long-term climate forecasts. During the summer, sectors of downtown Montreal recorded temperatures of up to 12 ºC higher than those recorded in surrounding rural areas. According to the forecasts, climate change is expected to result in an increase in the annual number of hot days in Montreal.
Rosemont – La Petite-Patrie (137,000 residents) is a densely built borough located in the centre of Montreal. The urban heat island (UHI) effect—a phenomenon whereby the temperature in an urban area is higher than in surrounding areas—is very pronounced in many parts of Rosemont – La Petite-Patrie. Climate change should increase the annual number of extreme heat days in Montreal. In April 2011, the Rosemont – La Petite-Patrie borough council revised its zoning bylaw to include four new regulatory measures aimed at addressing UHIs. The new system of regulations and permits provides an opportunity to educate the public and developers about the impact of UHIs on human health and energy consumption and to effectively apply the new regulatory measure. Although climate change was not a determining factor, the measures contribute to strengthening the resilience to climate change. While it is too late to measure the effect of Rosemont’s new zoning bylaw on the reduction of UHIs locally, the number of roofing permits issued to date is a good indicator of the impact of the new zoning bylaw. It shows that the regulations, along with a series of other policies, programs and tools, can be effectively used to strengthen resilience to climate change.