1 Samuel 12:17 - Joseph Benson’s Commentary on the Old and New Testaments

Is it not wheat-harvest to-day? At which time it was a rare thing in those parts to have thunder or rain; the weather being more constant in its seasons than it is with us, and the rain being wont to fall periodically, only in the autumn and the spring, called the former and latter rain. He shall send thunder and rain That you may understand that God is displeased with you, and see how foolishly and wickedly you have acted, in rejecting the government of that God at whose command are all things, both in heaven and in earth.