Global Temperature Anomalies

Dataset provides monthly surface temperature anomalies from 01/1900 to 12/2023

HadCRUT4 time series: ensemble medians and uncertainties
The following files contain time series derived from the HadCRUT4 grids for selected regions. These 'best estimate' series are computed as the medians of regional time series computed for each of the 100 ensemble member realisations.

The dataset is presented as an ensemble of 100 dataset realisations that sample the distribution of uncertainty in the global temperature record given current understanding of non-climatic factors affecting near-surface temperature observations. This ensemble approach allows characterisation of spatially and temporally correlated uncertainty structure in the gridded data, for example arising from uncertainties in methods used to account for changes in SST measurement practices, homogenisation of land station records and the potential impacts of urbanisation.