The Earth is closest to the Sun during the Northern Hemispheres winter, in the months December and January. This is due to the elliptical orbit of the Earth. The point when the Earth is closest to the Sun is called the perihelion.
To learn more: http://news.nationalgeographic.com/news/2011/06/110630-earth-farthest-from-sun-july-4-independence-day-space-science/
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