Ol' wise tale says when oak trees shed a bountiful crop of acorns, a cold winter is soon to be. reason is trees, and vermin sense cold winter, tree needs to spread around its seeds. does so by producing massive amount of seeds if many squirrels will be storing them away on a massive scale due to impending cold. some of the massive amount foraged get left behind, and help spread the acorns beyond where they fall. hearing thousands of acorns hitting metal shed roof for 2 weeks now, tells me to be prepared.