My hair grew about 1.75 inches since August 20. I color my hair and my dark roots are how I measured my hair (I use L'oreal Preference UL51 for dark hair).
Now, I am taking Viviscal, Spring Valley Hair, Skin and Nails vitamins (from Wal-Mart), Vitol Ener-G, and MSM to grow out a super botched mullet-esque hair cut (on one side lol) so I am happy with the growth.
Without all the vitamins my hair growth is average 1/2 inch a month.