Earth’s hottest 12-month streak

Climate Central's analysis using the Climate Shift Index (CSI) reveals that 90% of the global population experienced at least 10 days of temperatures strongly influenced by climate change between November 2022 and October 2023. The study highlights that one in four people faced extreme heat streaks of at least five days driven by carbon pollution, with the strongest influences observed in the developing world and specific high-impact areas like Jamaica and several U.S. cities.

• Between November 1, 2022, and October 31, 2023, the global average temperature was 1.3°C (2.3°F) above pre-industrial levels, marking the hottest 12-month period on record. During this time, 7.3 billion people, or 90% of the global population, experienced at least 10 days where temperatures were at least three times more likely due to climate change (CSI level 3 or higher).
• Approximately 1.9 billion people, representing one in four people globally, experienced extreme heat streaks lasting at least five days that were strongly influenced by carbon pollution, with a CSI of 2 or higher.
• In the United States, 49% of the population (162.6 million people) experienced 10 or more days at CSI level 3 or higher. Houston, Texas, recorded the longest streak of extreme heat made more likely by carbon pollution among 700 large global cities, lasting 22 days.
• The influence of climate change on heat was most pronounced in the developing world. Jamaica recorded the highest average CSI of any analyzed country at 4.5, followed by Guatemala (4.4) and Rwanda (4.1).

APA

Climate Central (2023). Earth’s hottest 12-month streak. https://www.climatecentral.org/climate-matters/earths-hottest-12-month-streak-2023

Chicago

Climate Central. Earth’s hottest 12-month streak. 2023. https://www.climatecentral.org/climate-matters/earths-hottest-12-month-streak-2023.

Wikipedia

{{cite report |author=Climate Central |title=Earth’s hottest 12-month streak |date=9 November 2023 |url=https://www.climatecentral.org/climate-matters/earths-hottest-12-month-streak-2023 |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{climatecentral2023earths, author = {{Climate Central}}, title = {{Earth’s hottest 12-month streak}}, institution = {Climate Central}, year = {2023}, month = nov, url = {https://www.climatecentral.org/climate-matters/earths-hottest-12-month-streak-2023}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }