As you have learned, determining salaries is a difficult challenge because there are so many variables. Many salary survey data is available, but costs a considerable amount to obtain. Published by Architect Magazine, the 2009 salary below will begin to answer your question.
Below is some information from the Bureau of Labor Statistics.
Median annual wages of wage-and-salary architects were $70,320 in May 2008. The middle 50 percent earned between $53,480 and $91,870. The lowest 10 percent earned less than $41,320, and the highest 10 percent earned more than $119,220. Those just starting their internships can expect to earn considerably less.
Earnings of partners in established architectural firms may fluctuate because of changing business conditions. Some architects may have difficulty establishing their own practices and may go through a period when their expenses are greater than their income, requiring substantial financial resources.
Many firms pay tuition and fees toward continuing education requirements for their employees.The starting salary of recent graduates will vary depending on their degree (BArch vs. MArch), firm size, location (Urban vs. Rural), amount of experience, etc. It is not an exact science.
When discussing this topic with students, I will state that starting salaries can start between 30 - 45K and will increase with experience again depending on the factors I listed above. When seeking employment, be sure to know your worth and how to negotiate.