Watch 100 years of December sea surface temperature anomalies updated through 2025.

Watch 100 years of December sea surface temperature anomalies updated through 2025. There's a lot of year-to-year variability, but a clear long-term warm signal is evident over time due to human-caused climate change.

Data from https://psl.noaa.gov/data/gridded/data.noaa.ersst.v5.html