A recent article in LD Online (a website dedicated to information on learning disabilities and ADHD) discussed research on dyslexia and summer education:
On Summer Loss
By: National Summer Learning Association (2004)
Studies also show that the magnitude of summer learning loss varies significantly by grade level, subject matter, and family income. Most importantly, research identifies the cumulative effect of summer learning differences as a primary cause of widening in-school achievement gaps between students by family income.
A recent study by Harris Cooper, professor of psychological sciences at the University of Missouri, estimates that summer loss for all students equals about one month on a grade-level equivalent scale. Read more here....