Then just look at this picture. You just don't see this on your highway or local road commute. Sunshine streaming through the trees in a park right along the river.
And yeah, it was about 30 degrees when I headed out the door for the ride this morning. So I know why you hesitate, but a t-shirt, long sleeve t-shirt, and a windstopper vest is all it takes to keep warm while riding in these temps (well...pants, and a hat and gloves help). So get out there and enjoy the great morning sunshine with a bike commute.