A survey was done in about 1990, when there was a rash of teacher strikes in Pennsylvania.
It was found that teachers made about the same as equivalently experienced and educated private sector employees, who worked twelve months a year compared to nine by teachers. Furthermore, the survey found that the benefit packages were worth twice that of equivalent private sector employees.
My wife has been a teacher in Texas her for 15 years. I will tell you that the benefits here are pathetic. She is on my insurance because hers gets worse and more expensive every time.