I missed this story last summer that Portland temperature averages have risen by 3.7 °F since 1970. While it doesn't sound like much, as an average that's quite a substantial change.
Portland's summer heat rises: city sees 3.7F increase since 1970, more triple-digit days
According to Climate Central, summers are heating up in 234 major US cities by an average of 2.6 degrees Fahrenheit since 1970.
katu.com