The ACE index is a measure of tropical cyclone activity (NOAA Climate Prediction Center, Severe Weather Europe). Researchers at Colorado State University (CSU) have predicted that the Atlantic hurricane season, which runs from 1 June 2025 to 30 November 2025, "will have above-normal activity," with ACE forecasted at 155 (CBS News, CSU - 2025 Atlantic Hurricane Season Forecast). The question will be suspended on 30 November 2025 and the outcome determined using data provided by CSU through and including 30 November 2025 (CSU - North Atlantic Ocean Statistics, set "TC METRIC" to "Accumulated Cyclone Energy", CSU - Real-Time Global Tropical Cyclone Activity). As of the launch of this question, CSU reported the ACE index value for 2024 as 161.6.

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The question closed "At least 120.0, but less than 140.0" with a closing date of 1 December 2025.

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