During the global winter caused by the asteroid impact, temperatures fell below freezing.
Notes on verification
Corroborated by multiple peer-reviewed studies (PNAS, GRL, Nature Geoscience) and institutional summaries (LPI/USRA, AGU) consistently reporting sub-freezing global temperatures following the Chicxulub impact. [tier=gold indep_score=0.95 clusters=3 claim_tier=notable]
Sources
- 30 Seconds May Have Made All the Difference for Dinosaurs | HISTORY (seed:history_and_archaeology)
- https://www.lpi.usra.edu/science/kring/Chicxulub/global-effects/ (corroboration)
- https://news.agu.org/press-release/dinosaur-killing-asteroid-impact-may-have-cooled-earths-climate-more-than-previously-thought/ (corroboration)
- https://www.sciencedirect.com/science/article/pii/0012821X94901864 (corroboration)