| Hotter maximum temperatures. | Maximum temperature: The average maximum temperature in a selected period | National Regional |
| More hot days. | Hot days: Number of hot days where the maximum temperature is above a locally relevant threshold such as 25 or 30°C | National Regional - Quebec: Climate Portraits (Max temp>30, 32)
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| Local hot days: Percentage of days when daily maximum temperature is above the 90th percentile | National |
| More hot nights. | Hot nights: Number of hot nights (tropical nights) where the minimum temperature is above a locally relevant threshold such as 18 or 22°C | National Regional - Climate Portraits (Number of warm nights Min temp>18, 20, 22)
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| More humidex days. | Humidex days: Number of humidex days over a locally relevant felt threshold such as 30 or 40 | National |
| Hottest day becoming hotter. | Hottest day: Highest maximum temperature in a selected period | National Regional |
| Hottest Day Return Level: Extreme temperature events (max daily max temp) that would be expected to occur once during a specified return period | National |
| Increasing frequency, intensity, duration, and changes in timing of heatwaves. | Heatwaves (as defined by locally relevant thresholds): - Average length of heatwaves
- Longest spell of 30°C days: longest series of consecutive days with maximum temperature ≥ 30°C
- Hot (30°C) Season: The number of days from the first day of the year with maximum temperature ≥ 30°C to the last day with maximum temperature ≥ 30°C
| National Regional |
| Increased cooling needs. | Cooling degree days | National Regional - Climate Portraits (Cooling degree-days>18, 22)
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| Increases in July design temperatures. | Building design temperatures: - July 2.5% dry bulb design temperatures: Also called July temperature 97.5%
- July 2.5% wet design temp: Also called July wet-bulb temperature 97.5%
| National |
