The three colleges I've worked at, one four-year university and two community colleges, pay anywhere between 425-500 a credit hour per semester. So, for one three credit hour course from Sept. - December, I'll make a total of $1500 before taxes for the semester. Split that monthly, for one course, I'll make 375 a month. Weekly, that's ~$93. Per hour? About a couple bucks depending on how you want to calculate it.
I can definitely attest to this, in Ontario at least. At my job I create the salary