While the winter Climate_of_Vancouver is mild when compared to Edmonton, Winnipeg & Montreal, it's still cold & damp for at least half of the year.
https://en.wikipedia.org/wiki/Climate_of_Vancouver#Temperatures
Some people do build private swimming pools in Vancouver & SW BC, but unless they are heated & covered, it's pointless. That's because there are only a few months of the year when it's warm enough to be in an outdoor, unheated pool.
https://en.wikipedia.org/wiki/Climate_of_Vancouver#Rain
Summer is the best 3 months out of the 12, but even during the summer the crappy, cold & damp weather can still drop by.
