The Chronicles of Higher Education is a weekly professional journal that is widely read in the Education community. They publish a very detailed annual survey of the salaries paid instructors at all levels at all different kinds of schools. You can search for them online.

As a general rule, Professors do not make very high salaries compared to other professionals. The typical salary for the highest ranked PhD professors who have had many years of service is between $70K to $90K. That is much less than many attorneys, physicians, pharmacists, etc make, not to mention virtually any successful business executive.

Private college/university vs. state university/ college?

Community college?

Adjunct instructor or professor vs. full associate professor?

Master’s Degree vs. PhD?

Number of students enrolled per class?

Level of experience?

How much research you’ve done?

Any published journals?

All I can think of now!