Is a 5' 105 pound 5th grader overweight?

When I was in 5th grade, I weighed about 96 pounds. Do not let the girls who are 70 pounds or 80 pounds get to you. Many of them are underweight! some were in the 90's is average unless you are really tall or really short. The average short 5th grader is around 70 or 80. If you are really tall, you may even be a bit over 100! But, if you are 100, or more in 5th grade and you are average weight (4,10) then you're over weight, i'm not trying o say that you need to lose weight (I mean common', your in 5th grade) but it is considered unhealthy. Maybe changing your diet, by having salad 4 times a week. Thats what I brought for lunch in 5th grade; you're born beautiful remember that.
From what I know it can vary from 80 pounds to 110 pounds.
There is no suggested weight for a 5th grader. Because a 5th grader can constitute of different age i different countries. You should find the age of your child and see the healthy weight of that age group.