Seattle is quite a bit milder than Melbourne, I think. Our summers are generally in the 20's C. I don't think we've broken 100 F in a few years; even temperatures in the 90's F are pretty unusual. Though our winters are probably similar, maybe a bit colder. But not much, despite being a lot higher latitude.

Is Melbourne humid in summer? You get a lot of summer rain, right?

(I'm asking partly because I am a bit of a weather/climate geek and therefore genuinely interested, but also because I might actually move to Melbourne!)