First congratulations are in order.
Now for the next decisions. There seem to be lots of us who live in BC who can give you suggestions. You seem to like a big city as the heart of Calgary drew you back near the downtown core. Being that you're leaving Alberta to get away from the cold I doubt you want to be any farther north than Kamloops.
Kamloops - closest drive back to Calgary but the #1 is a wicked road and often closed in the winter. There are always flights out. It's about 4 hours on the Coquihalla. This is no longer a toll road. If you like flat, Kamloops isn't for you. Can be hot in the summer, can be cold in the winter. Definitely four seasons.
Kelowna is actually farther to Vancouver than Kamloops because the Connector to the Coke is slower. An international airport can get you cheap flights back to Calgary. Kelowna is in a valley so there is flat in central area with the suburbs up on the hill. Can be hot in the summer, can be cold in the winter. Definitely four seasons.
Describing the cold - nothing compares to what you've been describing for Calgary.
Vancouver - overall the nicest weather and you don't shovel rain. An airport that can you anywhere. Downtown core is very pricey but I haven't followed it.
Victoria - very pretty city. Some people don't care for being on the island.
Then there's all the other towns in the interior.
That's just a quick summary to start with. If you give us more of what you're looking for maybe we can help you in your search. This is very exciting.