Time and time again 9:30 am - 10:30 am has proven to be the magic hour for me. Most days that I hunt, I hunt from first light to dark, non-stop. I've had horrible luck with the last stand of the day (the sunset stand) - in three years I've only had one positive encounter on a sunset stand, but... it was a triple, all three killed. I seem to have similar results with early morning compared to mid-day stands.
For me, winds 10 mph and less are ideal, 10 - 20 mph are huntable, but more challenging, and at 20+ mph I begin to question whether it is even worth going out. I prefer cold and cloudy days, you know... the three C's... cold, calm, cloudy.
FWIW, I hunt in the wide open praries and deserts of Wyoming.