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Looking at the last 50 years of data and it's pretty clear Seattle is warming up: https://www.currentresults.com/Weather-Decades/USA/WA/Seattl...

Whether this is due to climate change, urban development or something else entirely could certainly be explained in more depth, but the trend is there.

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Going back further, you can find 100 degrees in mid July of 1941: https://www.currentresults.com/Yearly-Weather/USA/WA/Seattle...

Though, that was before Sea-Tac was the official weather station: https://www.king5.com/article/news/local/seattle/heres-why-s...

That link is better than the headline because it is averaging hundreds of days for each data point.

A four day heat wave is not very compelling data on its own.

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