In 2023, Greater Sudbury experienced seven days under a heat warning. The Ontario Provincial Climate Change Impact Assessment Technical Report anticipates Northeast and Northwest Ontario will see temperatures from 3.8 and 4.1 days now rise to over 35 days per year, on average, with impacts felt in the far North, Northwest and Northeastern Ontario despite the absolute numbers being lower compared to Southern Ontario. The report goes on to predict that by the 2080s, major cities like Sudbury could see as many as 55 days a year with temperatures over 30 degrees, in comparison to the 10 days being experienced now. The Hot Weather Response Plan (HWRP) is intended to alert those most at risk of heat-related illness that hot weather conditions are either imminent or currently exist and to take appropriate precautions.