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the claim

Illuminance decreases predictably with increasing cloud cover.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that Illuminance decreases predictably with increasing cloud cover?

Yes. Multiple studies demonstrate that increasing cloud cover systematically attenuates solar radiation and decreases surface illuminance.

Verdict: SUPPORTED · 4 sources for, 0 against · Last checked

The analysis

The retrieved literature consistently supports the well-established physical principle that cloud cover reduces surface solar radiation and illuminance through scattering and absorption. Papers 2, 3, 9, and 11 all explicitly discuss how cloud parameters (such as cloud fraction and cloud optical depth) decrease surface-reaching shortwave radiation and solar irradiance.

Evidence for · 4
Doubled Saharan dust emissions decrease solar photovoltaic potential through dust–radiation–cloud interactions in CMIP6 simulation
2025
Demonstrates that cloud-mediated effects significantly reduce surface downwelling shortwave radiation and solar photovoltaic potential.
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Adigun, P., Dairaku, K., Ogunrinde, A. T., & Xue, X. (2025). Doubled Saharan dust emissions decrease solar photovoltaic potential through dust–radiation–cloud interactions in CMIP6 simulation. doi.org. https://doi.org/10.1088/2752-5295/ae2ef3

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More for · 3
Unveiling the paradox of reduced surface solar radiation in February 2020 during COVID-19 lockdown: aerosol-cloud-dynamics interactions in Beijing
2026
Indicates that modified cloud physical properties and increased low cloud cover substantially attenuate surface incident solar radiation.
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Zhang, X., Ye, D., Yang, S., & Ma, Q. (2026). Unveiling the paradox of reduced surface solar radiation in February 2020 during COVID-19 lockdown: aerosol-cloud-dynamics interactions in Beijing. doi.org. https://doi.org/10.1088/1748-9326/ae3b54

Estimation of global solar radiation data based on satellite-derived atmospheric parameters over the urban area of Mashhad, Iran.
2021
Shows that cloud fraction is a crucial predictor that inversely affects global solar radiation attenuation.
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Bamehr, S. & Sabetghadam, S. (2021). Estimation of global solar radiation data based on satellite-derived atmospheric parameters over the urban area of Mashhad, Iran.. doi.org. https://doi.org/10.1007/s11356-020-11003-8

Modification of spectral ultraviolet doses by different types of overcast cloudiness and atmospheric aerosol.
2011
Documents wavelength-dependent attenuation of ground-level solar radiation under various overcast cloudiness conditions.
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Aun, M., Eerme, K., Ansko, I., Veismann, U., & Lätt, S. (2011). Modification of spectral ultraviolet doses by different types of overcast cloudiness and atmospheric aerosol.. doi.org. https://doi.org/10.1111/j.1751-1097.2011.00889.x

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first checked31 Jul 2026
judged → SUPPORTED · 7531 Jul 2026
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