I challenge anyone to go back to the date and place of any key event in the first third of our nation's history (July 4, 1776; the Battle of Yorktown, the start of the Lewis & Clark expedition, the Battle of Gettysburg, etc.) and tell me what the ambient air temperature, barometric pressure, and relative humidity was at that time and place.
Good luck with that.
Sorry...I just couldn't afford to purchase a temp measuring device before we left...