Increasing Global Terrestrial Diurnal Temperature Range for 1980–2021

The 2021 IPCC report found that most studies show declining trends for the global diurnal temperature range (DTR) since 1950s, decreasing mainly during 1960–1980. This issue is revisited here using an up-to-date in-situ data set, Hadley Center Integrated Surface Database, constrained by rigorous station selection conditions. observed DTR trend was to reverse 1980–2021, increasing significantly at a rate of 0.091 ± 0.008°C decade−1. dominated faster daily maximum air temperature. in past four decades not fully captured raw CMIP6 models, as models only partially capture spatial patterns. With outputs and regionally-available observations, land then estimated, through emergent constraints, be 0.063 0.012°C study raises concern risks globally provides new insights into assessment.