I suggest you do a thorough check on the polls of past elections--thorough, not just picking and choosing.
No need to respond--if you do the check, you'll have your answer as to how accurate a snapshot polls are one month before an election.
You mean like the October polls that had Bush up over Gore by 6 to 8 points? Or the October polls that had Clinton leading Dole by 24 points? Or those October polls that had Reagan and Carter “too close to call”? Or those October polls showing Carter with huge leads over Fords. Same for Nixon over Humphrey?