What can't be seen is it was only 18° out that day. I live in SoCal so that was pretty cold for me.
If you've never been to Dealey Plaza, I recommend going. Mrs. 40 and I are both old enough to remember that day and found our visit there very interesting.
I went there in 1999 and found it fascinating. I also remember the day of the assassination. I was in 2nd grade; teacher took an intercom call from the front office, then informed us the president had been shot.