I'm not an expert on Germany at all, but when I was there (Bavaria region!!), most women seemed blonde to me - and I'm not even sure if it's all dyed or natural.
Men had a bit darker hair (light to medium brown, sometimes even dark brown) on the other hand.

Seems like naturally brunette women are not even common in the South? Are there gender differences?
Yes, Germans are not as light as Scandinavians, but claiming that Bavarians look Italian is probably also pure BS.

But I'm just an ignorant, so you can enlighten me if you want...