Monday’s winter storm forced school systems across the region to cancel school for yet another day, adding to what were already high snow day totals for many. With classroom instruction disrupted again, WAMU’s The Kojo Nnamdi Show decided to look into the question of “the snow day effect” and how it can impact classroom performance. Public Policy Professor and Graduate Program Director Dave Marcotte was a guest on Monday’s show and discussed a multi-year study he conducted to look into winter weather’s impact on schools in several states. One of the key findings was that a week’s worth of snow days …