Monthly climate report
Climate report: January 2025
Global land temperature (NASA GISTEMP v4) and atmospheric CO₂: where things stand at the end of January 2025.
Global temperature in January 2025
- January 2025 (land)
- +2.56 °Cversus 1901–1930
- Rank of the month
- Recordof 146 Januarys on record
- 12-month average
- +2.19 °C12 months ending January 2025
In January 2025, land areas worldwide were +2.56 °C warmer than the 1901–1930 average, according to NASA's GISTEMP v4 analysis, compared with +2.04 °C in January 2024. That makes it the warmest January in 146 years of records.
Over the 12 months ending in January 2025, the land average is +2.19 °C, against +1.98 °C over the previous 12 months. The highest 12-month average remains the one ending in August 2024 (+2.21 °C).
Every month since June 2023 has been more than 1.5 °C above the 1901–1930 average — 20 months in a row.
These figures cover land areas only. Land warms faster than the ocean, so the values are higher than the combined land-and-ocean averages usually quoted.
The last 13 months
| Month | Anomaly vs 1901–1930 |
|---|---|
| January 2025 | +2.56 °C |
| December 2024 | +2.38 °C |
| November 2024 | +2.01 °C |
| October 2024 | +2.16 °C |
| September 2024 | +1.95 °C |
| August 2024 | +2.25 °C |
| July 2024 | +1.93 °C |
| June 2024 | +2.08 °C |
| May 2024 | +1.79 °C |
| April 2024 | +2.20 °C |
| March 2024 | +2.52 °C |
| February 2024 | +2.47 °C |
| January 2024 | +2.04 °C |
The 10 warmest Januarys on record
Land areas, 1880–2025.
| # | Year | Anomaly vs 1901–1930 |
|---|---|---|
| 1 | January 2025this report | +2.56 °C |
| 2 | January 2020 | +2.36 °C |
| 3 | January 2007 | +2.32 °C |
| 4 | January 2024 | +2.04 °C |
| 5 | January 2017 | +1.88 °C |
| 6 | January 2002 | +1.86 °C |
| 7 | January 2016 | +1.86 °C |
| 8 | January 2019 | +1.81 °C |
| 9 | January 2022 | +1.73 °C |
| 10 | January 2015 | +1.72 °C |
Atmospheric CO₂
The annual mean rose from 421.08 ppm in 2023 to 424.60 ppm in 2024, +3.5 ppm in one year.
Sources and method
- Temperatures: NASA GISS, GISTEMP v4, monthly mean over land areas, rebased to 1901–1930 (file of November 14, 2026).
- Ranks use the months known at the date of the report. NASA slightly revises past values at each update, so figures can move by a few hundredths of a degree.
- CO₂: NOAA Global Monitoring Laboratory, Mauna Loa Observatory.