In the past 10 yrs., I've been gradually getting up earlier to cycle (by 7:30 am out the door. 6:00 am if it's really hot out) ..not just on workdays (out the door by 5:15 am)...but also on weekends.

It initially started because of the summer humidity when I lived in Ontario. For cyclists wanting to do fitness rides at a certain speed and including hills, most definitely humid heat is an energy-sucker. It's a great feeling to finish fitness stuff after 1-2 hrs. and still have a huge chunk of the morning and rest of day left.

Now here in Vancouver, it doesn't steam at 100% humidity. We get 75% humidity in summer, which is lovely to me. Whereas long-term West Coasters complain of "heat".

I'm not sure I could take up fitness walking in any weather. I just walk to places sometimes, because I have to ..due to lack of car and too much rain to make cycling comfortable. Walking to me is a transportation necessity, it is not really a fitness activity ...though in the end, as a secondary benefit, I do get some exercise.