Jamieson, Fausset and Brown on Genesis 31:40

40. in the day the drought ... and the frost by night--The temperature changes often in twenty-four hours from the greatest extremes of heat and cold, most trying to the shepherd who has to keep watch by his flocks. Much allowance must be made for Jacob. Great and long-continued provocations ruffle the mildest and most disciplined tempers. It is difficult to "be angry and sin not" [Ep 4:26]. But these two relatives, after having given utterance to their pent-up feelings, came at length to a mutual understanding, or rather, God influenced Laban to make reconciliation with his injured nephew (Pr 16:7).