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2025 Confirmed as Third-Hottest Year as Three-Year Global Average Tops 1.5°C

Scientists say rapid emissions cuts are now essential to avoid locking in a lasting overshoot of the Paris 1.5°C goal later this decade.

FILE - Paramedics provide aid to tourists and residents with an ambulance, next to the historical Spanish Steps, in Rome, Italy, July 1, 2025. (AP Photo/Andrew Medichini, File)
FILE - A boy cools himself in a fountain on a hot day in Moscow, Russia, July 9, 2025. (AP Photo/Pavel Bednyakov, File)
FILE - Tourists use umbrellas to shelter against the sun outside Hagia Sophia mosque during a hot summer day in Istanbul, Aug. 12, 2025. (AP Photo/Francisco Seco, File)
FILE - Tourists use an umbrella as they walk an alley of the Trocadero gardens during a hot day Monday, Aug. 11, 2025, in Paris. (AP Photo/Aurelien Morissard, File)

Overview

  • EU Copernicus/ECMWF and Berkeley Earth confirm 2025 ranked third after 2024 and 2023, with the UK Met Office concurring and WMO figures expected.
  • The 2023–2025 period was the first multi-year stretch averaging above 1.5°C, and Copernicus warns the long-term limit could be breached before 2030.
  • Global temperature in 2025 was about 1.47°C above pre-industrial levels, roughly 0.13°C below 2024 and 0.01°C below 2023.
  • Polar extremes stood out, with Antarctica’s warmest year on record, the Arctic’s second warmest, and record-low combined sea ice in February 2025.
  • Warming intensified extremes including Europe’s record wildfire emissions, Hurricane Melissa and Pakistan’s fatal floods, while scientists expect another very warm 2026 and note U.S. withdrawals from UN climate bodies complicate coordination.