New Study Reveals Key Drivers of Day-to-Day Temperature Swings Across Northern Hemisphere

Study Identifies Major Drivers of Day-to-Day Temperature Variability

Abrupt temperature swings between consecutive days—known as day-to-day temperature variability—have significant consequences for human health, ecosystems, and economic activity. However, the factors influencing these fluctuations and their year-to-year variations have remained poorly understood until now.

In a new study published in the Journal of Geophysical Research: Atmospheres, researchers Q. Liu and C. Fu analyzed observational data, reanalysis datasets, and CMIP6 climate model simulations spanning 1961 to 2014. Their findings reveal a coherent large-scale pattern of temperature variability across Eurasia and North America, primarily driven by the north–south movement of warm and cold air masses.

Seasonal Differences in Temperature Variability Drivers

The study highlights distinct seasonal drivers of temperature variability:

• Winter: Large-scale meteorological patterns are the dominant influence on day-to-day temperature swings.
• Summer: Local land–atmosphere feedbacks become more influential in shaping temperature variability.

These processes collectively reshape temperature gradients and influence storm activity and broader weather systems across the Northern Hemisphere.

Implications for Climate Risk Prediction and Adaptation

The research provides new insights into the mechanisms behind temperature variability, offering a scientific foundation for improving seasonal climate risk prediction and adaptation strategies. Understanding these drivers is crucial for policymakers, urban planners, and industries reliant on stable climate conditions.

"Overall, the findings provide new insights into the mechanisms of temperature variability and offer a scientific basis for improving seasonal climate risk prediction and adaptation strategies."

Citation and Access

Citation: Liu, Q., & Fu, C. (2026). Interannual variations in the day-to-day temperature variability in the northern hemisphere and possible causalities. Journal of Geophysical Research: Atmospheres, 131, e2025JD045754. https://doi.org/10.1029/2025JD045754

Text © 2026. The authors. CC BY-NC-ND 3.0. Except where otherwise noted, images are subject to copyright. Any reuse without express permission from the copyright owner is prohibited.