I think Tokyo is quite a bit warmer in the summer. Compare https://weatherspark.com/y/143809/Average-Weather-in-Tokyo-Japan-Year-Round https://weatherspark.com/

I think Tokyo is quite a bit warmer in the summer. Compare https://weatherspark.com/y/143809/Average-Weather-in-Tokyo-Japan-Year-Round https://weatherspark.com/y/143809/Average-Weather-in-Tokyo-J... and https://weatherspark.com/y/913/Average-Weather-in-Seattle-Washington-United-States-Year-Round https://weatherspark.com/y/913/Average-Weather-in-Seattle-Wa...