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the claim
Illuminance decreases predictably with increasing cloud cover.
the verdict
SUPPORTED
the evidence backs this
confidence 75/100

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

Evidence for · 4
Doubled Saharan dust emissions decrease solar photovoltaic potential through dust–radiation–cloud interactions in CMIP6 simulation
2025 · cited by 0
Demonstrates that cloud-mediated effects significantly reduce surface downwelling shortwave radiation and solar photovoltaic potential.
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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 · cited by 0
Indicates that modified cloud physical properties and increased low cloud cover substantially attenuate surface incident solar radiation.
Estimation of global solar radiation data based on satellite-derived atmospheric parameters over the urban area of Mashhad, Iran.
2021 · cited by 0
Shows that cloud fraction is a crucial predictor that inversely affects global solar radiation attenuation.
Modification of spectral ultraviolet doses by different types of overcast cloudiness and atmospheric aerosol.
2011 · cited by 0
Documents wavelength-dependent attenuation of ground-level solar radiation under various overcast cloudiness conditions.
The paper trail · every fact has a biography
first checked31 Jul 2026
judged → SUPPORTED · 7531 Jul 2026
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