How much does the average 11 year old grow each month?

i think it really just depends on the person different people grow at different times .

i have just turned eleven and i grow about 4 or 5mm a month at the most .You could try measuring yourself at the start and the end of each month for a while and that should give you your answer like i said you might grow a cm a month and someone your age might grow 2 ... all depends on the person

xx hope this helped.