With a global temperature 1.05°C (1.89°F) above average, December 2025 was the fifth-warmest December since global records began in 1850. Notably, the ten warmest Decembers have all occurred since 2015. This month marked the 50th consecutive December with temperatures at least nominally above the 20th-century average.

2025 ranked as the third-warmest year since global records began in 1850. The annual global surface temperature was 2.11°F (1.17°C) above the 20th-century average, falling behind the record-setting year of 2024 (by 0.22°F/0.12°C) and the second-warmest year, 2023 (by 0.04°F/0.02°C). The 10 warmest years in the historical record have all occurred since 2015. Additionally, 2025 exceeded the pre-industrial (1850–1900) average by 2.41°F (1.34°C).

• Upper ocean heat content was record high in 2025.
• Annual sea ice extent for both the Arctic and Antarctic regions ranked among the three lowest years on record.
• The Northern Hemisphere snow cover extent was the third lowest on record.
• There were 101 named tropical storms across the globe in 2025, which was above average.

Assessing the Global Temperature and Precipitation Analysis in 2025