I'm curious what the rates of walking are in Sacramento now, given that it's got that whole "City of Trees" moniker and is also hot as Hell during the summer. I've honestly never been there in the summer, so I couldn't even share anecdotes. I'm not finding anything useful on Google.

What you say makes sense, when I walk in my own (new-ish development) neighborhood in Orange county, I specifically go to the areas where trees are more developed and provide more shade.