It's not really a "walkable" city if you are getting ass-blastes by the sun in the middle of summer. My small town is definitely a walkable city and has trees lining pretty much every street since something has ro go between the road and the sidewalk.
Trees are ideal because they:
- Will stop a car dead in its tracks if it drifts towards the sidewalk Produce shade to keep the surrounding area cool Are natural sound insulation (my town is on a busy cargo rail line and i never hear trains in the summer, but hear them frequently in the winter when the trees are bare) reduce pollution and increase air quality
Any town that is trying to become more walkable will put trees everywhere they are a cheap and easy way to make everything more pleasant.