Seattle
-Almost never gets above 80 (it is frequently cloudy if that bothers you though)
-Huge EDM scene with nightclubs downtown
-Green everywhere and tons of nice parks. Hikes & mountains are a short drive away.
-Bus system will take you anywhere & building a brand new light rail system (traffic can be bad during rush hour though)
-See point 2
-Gigabit internet or FiOS most (but not all places, you'd want to check specific neighborhoods)
One of the only real downsides is that depending on the neighborhood it can be frickin expensive, most sane people live in suburbs just outside the city proper, which are just as nice.