There is some evidence of lightning occurring on Venus.
Notes on verification
Multiple independent missions (Venera, Pioneer Venus, Galileo) reported evidence consistent with lightning, though Cassini found none and the topic remains scientifically contested. The claim is carefully hedged as 'some evidence,' which matches the state of the science. [tier=gold indep_score=1.0 clusters=4 claim_tier=notable]
Sources
- Ashen light (wikipedia)
- https://www.nature.com/articles/279614a0 (corroboration)
- https://science.nasa.gov/missions/cassini/cassini-scientists-see-no-sign-of-lightning-on-venus/ (corroboration)
- https://progearthplanetsci.springeropen.com/articles/10.1186/s40645-018-0181-x (corroboration)
- https://www.science.org/content/article/signs-lightning-venus (corroboration)