Diurnal Temperature Range Dynamics in Climate Systems

The diurnal temperature range (DTR), defined as the difference between daily maximum and minimum surface air temperatures, is a sensitive indicator of climate variability and change. Over recent decades, global observations have revealed complex and regionally heterogeneous trends in DTR, reflecting interactions among surface energy fluxes, cloud cover, soil moisture and atmospheric composition. In many regions, a long-term decline in DTR during the latter half of the twentieth century has given way to stabilisation or even modest increases, driven primarily by alterations in daytime warming rates. These shifts carry broad implications for heat-related health risks, agricultural productivity and ecosystem functioning, since many biological and physical processes depend critically on the timing and magnitude of temperature fluctuations. Modelling studies project that future DTR trends will vary strongly with greenhouse-gas emissions, aerosol burdens and land-use changes, emphasising the need for integrated assessments of sub-daily temperature dynamics in climate risk evaluations and adaptation planning.

Research from Nature Portfolio

Recent studies have re-examined sub-daily temperature patterns and uncovered a noteworthy reversal of previously observed nocturnal warming dominance. In one analysis, the warming rate of daytime maximum temperatures has accelerated relative to night-time minima, expanding the DTR in recent decades; this shift is attributed largely to reduced cloud cover and increased solar irradiance at the surface. A regional assessment using a non-stationary decomposition method has further demonstrated that trends in DTR vary markedly across climatic zones, with positive increases along humid coasts and declines in arid interiors, particularly during winter and post-monsoon seasons. Complementary research on precipitation deficits in China has shown that dry conditions can amplify extreme DTR events, with a substantially higher likelihood of pronounced day–night temperature swings following periods of low rainfall, especially during summer.

Diurnal Temperature Range Dynamics in Climate Systems publication trend

The graph below shows the total number of articles in diurnal temperature range dynamics in climate systems across all publications each year (not limited to Nature Index journals).

Technical terms

Diurnal Temperature Range (DTR): The difference between the daily maximum (Tmax) and minimum (Tmin) surface air temperatures.

Asymmetric warming: A phenomenon whereby daytime and night-time temperatures increase at different rates, altering the DTR.

Solar irradiance: The flux of incoming solar radiation reaching the Earth’s surface, influenced by atmospheric constituents and cloud cover.

Cloud radiative feedback: The effect of changes in cloud properties on the balance of incoming and outgoing radiation, impacting surface temperatures and DTR.

References

1. Reversed asymmetric warming of sub-diurnal temperature over land during recent decades. Nature Communications (2023).
2. Unravelling Diurnal Asymmetry of Surface Temperature in Different Climate Zones. Scientific Reports (2017).
3. Precipitation deficits increase high diurnal temperature range extremes. Scientific Reports (2015).
4. Diurnal Temperature Range and Its Response to Heat Waves in 16 European Cities—Current and Future Trends. Sustainability (2023).
5. Global variation in diurnal asymmetry in temperature, cloud cover, specific humidity and precipitation and its association with leaf area index. Global Change Biology (2020).
6. How aerosols and greenhouse gases influence the diurnal temperature range. Atmospheric Chemistry and Physics (2020).