By Canadian standards, Vancouver doesn't have much of a winter but yes, it does snow in Vancouver - not a whole lot and never for long, but enough to considerably slow down traffic and public transportation when it does happen. And I might be used to cold winters but because Vancouver is so damp, a -1°C there felt like at least a -10°C at home because the chilling humidity would get right through my clothes, no matter how many layers I was wearing. So as I was shivering in my winter coat, hat, gloves and boots, I was shocked to see a substantial number of Vancouverites walking around in shorts and t-shirts!! My friend's analysis of the situation, which I can only assume to be the right one until someone comes up with a better explanation, is that people in Vancouver hate winter so much that they live in complete denial of its existence, even on the coldest days!!
From about November to March (sometimes longer), it rains...it seems to never stop. In fact, I think the last 2 January's had something like 29 days of rain each. Its not ever heavy rain, its just a steady drizzle, even a mist. But if you are coming there looking for sun...think again!
On the other hand, from around July to October, it hardly rains at all...so dry in fact, that the grass turns brown. It is great for the beach, etc. just not for your lawn (if you live there)!
Spring comes early in Vancouver. Sometimes the new plant growth starts emerging as early as January, although most blossoms such as the Japanese cherry trees, or flowers such as tulips, hyacinths and daffodils are in full bloom throughout March and April. A local tradition is to drive through the west side of Vancouver... down Granville Street and head west down any of the many avenues... and admire all the Japanese cherry trees in bloom. It's so magical at that time of the year to see the confetti-like blossoms flutter to the ground. Another option is to walk through Stanley Park's gardens. They are gorgeous in the spring.