I finished analyzing 828 open long-term GHCN and threaded weather stations across the Lower 48 and computed a mean of hot days by year. Results concur with other analyses that extremely hot days have declined and were far more common in the Contiguous U.S. prior to 1960. 🌡️ pic.twitter.com/a8crSrgQgX

— Chris Martz (@ChrisMartzWX) September 16, 2022