The global temperature anomaly is how much today’s global near surface temperature differs from the average temperature between 1850 and 1900.

This tool shows how climate hazards may change compared to the historical average between 1850 and 1900.

1 °C is the estimated average global temperature anomaly between 2000 and 2020.

Current advice is to plan for 2 °C and assess the risks for 4 °C of global warming.

This has been calculated using the HadCRUT5.0.2.0 ensemble from Morice et al. (2021).