How much does an Asst. Professor - Mechanical Engineering make in New Mexico? The average Asst. Professor - Mechanical Engineering salary in New Mexico is $78,416 as of November 25, 2019, but the range typically falls between $65,715 and $93,061. Salary ranges can vary widely depending on the city and many other important factors, including education, certifications, additional skills, the number of years you have spent in your profession.