From snow-topped mountains and sun-drenched beaches, Vancouver has something to offer in every season.
It is not as cold here as you might think. In fact, Vancouver has some of the mildest weather in Canada with temperatures ranging on average from 20 Celsius (70 Fahrenheit) in summer to 0 - 5 Celsius (about 45 Fahrenheit) in winter.
Winter usually brings more rain than snow. Make sure you are prepared for wet weather with warm waterproof clothing. If you don't already have warm and waterproof clothing don't worry, there are many shops, including second-hand shops, that carry a wide selection at affordable prices.
UBC has its own rooftop weather station at the Point Grey campus; check their website for current conditions. Wikipedia has additional information and a climate chart for Vancouver.