Cloudy nights are warmer than clear nights due to atmospheric infrared radiation.
Cloudy nights are consistently warmer than clear nights because clouds absorb and emit downward longwave infrared radiation back toward the Earth's surface, reducing heat loss.
The claim is a well-established meteorological fact supported by multiple papers in the literature showing that clouds trap nocturnal longwave radiation and warm the surface at night.
A. Pyrgou, M. Santamouris, I. Livada. Spatiotemporal Analysis of Diurnal Temperature Range: Effect of Urbanization, Cloud Cover, Solar Radiation, and Precipitation. 2019. https://doi.org/10.3390/CLI7070089
Paper 3 demonstrates that cloud cover strongly influences the diurnal temperature range by affecting net longwave radiation and reducing extreme temperature drops.
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Luo H, Quaas J, Han Y. Diurnally asymmetric cloud cover trends amplify greenhouse warming.. 2024. https://doi.org/10.1126/sciadv.ado5179
Paper 8 notes that nighttime clouds warm the surface by trapping longwave radiation, acting as a greenhouse effect.
Ayoub Al mashoudi. Non-rainy cloud cover dynamics and their influence on temperature variability in Chefchaouen, Western Rif, Morocco. 2025. https://doi.org/10.51865/cejgsd.2025.7.1.3
Paper 11 shows that stable cloud cover mitigates daytime heating while enhancing nocturnal warming through longwave heat retention.
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