John Wesley on 1 Samuel 12:18

Samuel - Who had such power and favour with God. By this thunder and rain, God shewed them their folly in desiring a king to save them, rather than God or Samuel, expecting more from an arm of flesh than from the arm of God, or from the power of prayer. Could their king thunder with a voice like God? Could their prince command such forces as the prophet could by his prayers? Likewise he intimates, that how serene soever their condition was now, (like the weather in wheat harvest) yet if God pleased, he could soon change the face of their heavens, and persecute them with his storms.