I don't have any definitive proof for you. It's hard to find reliable sources for internship pay. This being an internet forum, you'll have to take my anecdotal evidence (with a grain of salt, if you'd like).
My friend interned at Genentech for something like 15-20 an hr. I'm not sure of the exact number, but it's that range. Another friend of mine interned at facebook, and for the 2.5 months he worked there, he made full salary.
There is plenty of data out there for straight-out-of-undergrad starting salaries though. If you have good grades from a good school and can interview well, it's not unreasonable to expect 50k+. I'm working at my first job straight out of undergrad, in a health-related field, at ~60k (something like 25-30 an hour if i work 40 hr weeks, which sadly, i don't) and a small year end bonus. Top tech companies, such as Facebook, Google, and well venture-backed start-ups, offer $80-90k for top engineering graduates. First year analysts in investment banks and top consulting firms start at ~60k+ and can make significant bonuses.
You can check salaries to your heart's content at glassdoor.com.
P.S. Sorry if I sound kind of entitled, but this had been my experience. Of course, many people choose lower paying jobs because it's more meaningful to them. I'm also not attacking your experience in any way. In the end, I think a lot of this job hunting business comes down to luck and getting off on the right foot. (Ex. if you missed the main recruiting season, regardless of your ability, it's very slim pickings from there.)