Actually, the weather in Vancouver and Seattle are not bad as they have the Pineapple Express. https://en.wikipedia.org/wiki/Pineapple_Express
11 degree water, on the other hand, is like out of the cold water tap. Not so great for outdoor activity. Add to that the windchill factor if you're running or cycling.
Clear, sunny weather and -3 degrees is better than pouring rain and 11 degrees.
Staying warm isn't much of an issue for outdoor activity. It's not hard to achieve: an extra layer, some head gear and gloves; being dry is more important.