Using the reconstruction provided by @webberweather for ENSO, here are all the warm pools since 1856 when OND ENSO is -0.5 or colder in ERSSTv5 (n=46). Usual caveats apply here with historical datasets. You will notice the gradual expansion of the warmest waters. pic.twitter.com/Vya4P7bnmz

— Anthony Masiello (@antmasiello) October 20, 2022