In case you didn’t notice, Earth was its most distant from the Sun for 2011 around noon on Monday; 94,511,923 miles to be precise. Back in early January we were about 3 million miles closer (perihelion). The variation is caused by the elliptical nature of the Earth’s orbit around the Sun.
The distance to the sun is not what causes seasons. The seasons result from the 23.44º tilt of the Earth’s axis. Right now, it is the northern hemisphere that is tilted toward the sun — and it is 86º at 9:30.