The latest update of the five-year moving average of the Actuaries Climate Index, which measures changes in extreme weather conditions and sea levels, reported an increase in Spring 2024 compared to Winter 2024. 

This average now stands at 1.26 compared to the baseline average of zero during the reference period spanning 1961 to 1990. 

For the last update in August 2024, covering the winter period, the ACI was set at 1.22. "Because of a lag in the reporting of sea-level data, the five-year average initially reported for February 2024 (1.22) has since been revised to 1.23," stated the announcement of the update published on November 26. 

Comparison with Spring 2019 

The five-year moving average of the ACI has been revised following the addition of seasonal data for Spring 2024. This seasonal data was recorded at 1.29 for Canada and the United States. 

Since the five-year moving average is updated quarterly, the Winter 2024 data replaces the Spring 2019 data, which stood at 0.79. 

When ACI averages rise above the baseline of zero, it indicates that extreme climate events are becoming more frequent and sea level rise is continuing. 

Combination 

Quarterly seasonal data is collected to establish this index. The variables with the most significant impact on populations and the economy are considered: high and low temperatures, heavy precipitation, droughts, strong winds, and sea level. 

For the sea level sub-index, the five-year moving average for Canada and the United States stood at 3.12 in Spring 2024, compared to 3.08 in the previous quarter. In Spring 2019, the same sub-index was recorded at 2.46.