Earlier quoted context omitted.
I looked that up on the BLS website, and while you're not using the same units as them, your numbers don't seem to match up. According to BLS, the median pay is $53,230 per year, which would be closer to $26.50 an hour, assuming a 40-hour work week. http://www.bls.gov/ooh/education-training-and-library/high-s... Maybe the Forbes article you're referring to about is only counting classroom hours, which is a pretty abs…
The correct figure is 38.5 hours/week for 9 months/year. http://www.bls.gov/opub/mlr/2008/03/art4full.pdf That's about $33.5/hour for wages alone. It also ignores the value of gold plated health care + pensions, etc.
http://www.nea.org/home/12661.htm
That certainly matches the teachers I've known; they put in a ton of non-classroom hours, and often put in a fair bit of their own money.
A Gates Foundation survey puts it at 53 hours per week:
http://www.washingtonpost.com/blogs/answer-sheet/post/survey...
And for teachers involved in extracurricular activities, the average is over 11 hours a day.