@Romain
My experience with teachers’ salaries in the USA, has been as the son of a public school teacher, the brother of a day school teacher. As an Adjunct professor at both University and Law School
As a member of the Board of Directors who negotiates salaries and makes sure there is enough money to pay those salaries.
Excluding the adjunct professorial work, all the other teachers’ salaries are based on the school year: X dollars for the year, paid biweekly or bimonthly.
Part time specialists are paid by the course taught.
I have never come across American teachers paid by the month. In fact in public schools the pay is paid out over 10 months bi monthly (how teachers hate 5 week months and love February) UNLESS the teacher elects to receive less each pay period and receive payments over the summer break. This makes budgeting easier for the teacher.
The average teacher in our local public schools with a teaching license, bachelors and masters degrees and 10 years experience is being paid about $90,000 for a 185 day work year.
A teacher with similar qualifications in our local day school would earn about $50,000, but only teach a half day. Our local day schools don’t hire teachers without 4 year college diplomas.