The thing about Vancouver and generally coastal cities, is that the humidity is far higher in Vancouver. Then say, kelowna. I lived in kelowna for 15 years, yes it gets really hot there in the summer ( I remember one summer it said 44 degrees on our outdoor themometer. My point is that 30 degrees in Vancouver with humidity will feel like 33 , 34.
A 30 degree day in Vancouver is far more uncomfortable then a 30 degree day in kelowna.