On: Summers Are Getting Hotter

[IanDrake]

Can anyone explain why the base period is 29 years but then they step forward by 10 years?

Seems kind of arbitrary and when these types of things are arbitrary I wonder what alternative time frames with the same data might look like.

[TomSawyer → IanDrake]

This is the best answer to that, that I've seen: https://twitter.com/corbettmatt/status/891003236412469248

[cbcoutinho → IanDrake]

To my understanding it's a thirty year baseline - beginning Jan '51 to end Dec ' 80 (inclusive) is thirty years.