Dark blond.
My hair is almost identical in color to this:
Brown at the base, but with heavy ash blonde highlights.
Blonde, kid. Always spell it with an e.
When I was a kid, my hair darkened from blonde to brunette. Midway through, other kids made a point of telling me, “You have dirty blonde hair.” Fortunately, I found an ad for hair coloring (Clairol, maybe?) with a dozen pictures of models with different shades of blonde. I could pull it out and say, “No, I’m Kansas Wheat blonde, see?”
Always shut them up.
My hair colour was almost exactly the OP’s at that age, and everyone agreed it was brown.