Temps are fine May-September, however sunshine is too low after May.
Annual average high and low is horrible, lower than my ideal coldest winter month.
Winters are actually colder on average than Vancouver?
Summers are slightly warmer, but cloudier than Vancouver as well.
Because of precip and sunshine patterns I will have to rate it F+ or D-.
I'm not sure but I think I'd like Vancouver better.
Seoul and most of South Korea on the other hand I'd give a solid D
because it's a bit sunny, nearly subtropical in temps,
and only earns a D rating for being prone to continental cold bursts in winter.