"Heat records set in Pacific Northwest .. so statistically rare ..only once every several 1000 years on average. "

"On Sunday, Portland soared to its highest temperature in more than 80 years of record-keeping: 112 degrees.. 

Its intensity is so statistically rare that it might be expected only once every several thousand years on average. ...

https://www.washingtonpost.com/weather/2021/06/27/heat-records-pacific-northwest/