I would suggest November but it actually depends on where you live (a spring month would be good for most states)
For continental U.S. the answer is never. Since the earth's rotation axis is tilted 23.5 degrees with respect to its orbital motion around the su, one would have to be less than 23.5 degrees above or below the equator to have the sun pass direclty overhead
Answer:
true. I think it's helpfull