Talked to some locals around Skaha who claim to climb rock all year round on the right days... but I think you need to be pretty keen Nov - March and really pick your days.
Pretty good summer this year (we got here late April), had pretty reliable climbing around Van/Squam from May to Oct, and Skaha at the start of October was still a great temperature.
Drop me line if you're looking to climb around Van or Squamish next summer and are stuck for partners
We certainly aren't regretting moving here... just getting all our touring gear sorted now, getting ice guidebooks etc... looking forward to winter. And next summer making it out to the Bugs...