It's the hottest day of the year, and to cool down, George wants to build a snowman! But how can he build a snowman when there's no snow? George experiments with crushed ice cubes, but they melt too quickly. Mud... but it doesn't stay in the right shape. And rocks, which are too heavy to lift! George is stumped. What sticks together, doesn't melt, and wasn't heavy? Of course, sand! George convinces the Man with the Yellow Hat to drive him, Bill, and the Renkins to the beach, where they can all cool off and George can finally build his summer snowman.