The average aide salary at Festus Middle was $51,296 , which is 122 percent higher than the average salary for this job in Missouri, and 59 percent higher than the national average for this job . Aide salaries at Festus Middle typically range from $50,250 to $52,100 (25th to 75th percentile). The highest reported aide salary was $65,525. There are 9 employees at Festus Middle with the job title aide.