I don't think we realize just how much of a black swan that 1954 summer was. 1954 never got out of the mid 80s in Portland. There is only 1 other summer, 1874 that didnt hit 90 or higher, and that record is dubious since there is missing data. Sure its 1950s climo, but still, essentially 1/150 odds at the lowest (and I'd wager something like that is a 1/500 year based on 1950s climo but that estimate is just a guess).