I lost 40 pounds in 5 months. So - 8 pounds a month-ish, if you want an average.
Here's how it really happened:
I made some serious dietary restrictions and started exercising vigorously, starting May 31. My body was not used to this, since I overate and rarely exercised at my HW (ok, I would exercise for 15-30 minutes ish maybe two or three times a week, but that was not nearly enough to counteract all that I ate!). I lost 12 pounds in the month of June.
I did all this in July, but since I had a stall in weight loss, I only lost 5 pounds.
I lost 8 pounds in August, which was an excellent weight loss month for me since that was the month I stopped being overweight!
Five pounds in September.
Seven pounds in October
And three stubborn pounds in November makes goal!