"Trends in daytime and overnight temperatures during extreme heat events, Canada, 1948 to 2023",,,, ,,,, Trends,Daytime high (number of stations),Daytime high (percentage of stations),Overnight low (number of stations),Overnight low (percentage of stations) Increase (Statistically significant),27,5%,42,8% Increase (Not statistically significant),271,50%,308,57% Increase (Total),298,55%,350,65% Decrease (Statistically significant),18,3%,16,3% Decrease (Not statistically significant),222,41%,172,32% Decrease (Total),240,45%,188,35% Insufficient events,143,n/a,143,n/a ,,,, "Note: n/a = not applicable. Percentages may not add up to 100 due to rounding. The analysis does not include stations for which there are less than 30 years of temperature observations. For more information, please refer to the Methods section (www.canada.ca/en/environment-climate-change/services/environmental-indicators/extreme-heat-events.html#methods). The proportion of stations with statistically significant trends is low, but this is expected, given the rarity of extreme heat events, climate trend variability, large year-to-year variability at individual locations, and the limited number and distribution of reporting stations. To see trends at monitoring stations, refer to Annex A (www.canada.ca/en/environment-climate-change/services/environmental-indicators/extreme-heat-events.html#annex-a).",,,, Source: Environment and Climate Change Canada (2024) Third generation of homogenized surface air temperature data (www.canada.ca/en/environment-climate-change/services/climate-change/science-research-data/climate-trends-variability/adjusted-homogenized-canadian-data/surface-air-temperature.html).,,,, Available on the Environmental indicators website (www.canada.ca/environmental-indicators).,,,,