it is different depending on where you live. southern states such as Florida have a higher average pitching speed than northern states such as Vermont. however, the average pitching speed for most 12 yr olds tends to be from the mid-40s to the low-to-mid-50s.
average is early 30's to late 40's for a girl who practices daily, but ive seen 10 yr olds throw up to 65 mph
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