During summer months, the part of the world having summer isclose to a right angle to the rays of the sun, giving the most heatto the area exposed. During winter, the tilt of the earth means thesun's rays strike the earth at an angle, meaning that they spreadover a larger area, giving less heat. When it is summer in thenorthern half of the world, it is winter in the southern half.Temperature difference is not due to distance from the sun, but dueto the tilt of the earth. If distance was the determining factor,both north and south would be the same temperature.