The seasons depend on the angle of the earth. It rotates on an angle and isn't quite sphere, so part of the earth will always be leaning away from the sun. As the earth orbits the angle changes causing a change of seasons. The sun is far away from your country during winter.
The Earth is closest to the Sun in the winter only if you are in the northern hemisphere. Here is a bit of info I got US Navy Observatory site. aa.usno.navy.mil/faq/docs/seasons_orbit.php
The Earth's orbit is very close to being a perfect circle, but not quite. It is somewhat elliptical, which means that the distance between the Earth and the Sun varies over the course of the year. This effect is too weak to cause the seasons, but it might have some influence over their severity.
The Earth reaches perihelion — the point in its orbit closest to the Sun — in early January, only about two weeks after the December solstice. Thus winter begins in the northern hemisphere at about the time that the Earth is nearest the Sun.
OK, Class, listen up:
Earth is closest to the sun every year in early January, when it’s winter for the Northern Hemisphere. We’re farthest away from the sun in early July, during our Northern Hemisphere summer.
On January 4, our planet Earth reaches its closest point to the sun for all of 2017 at 14:18 Universal Time (8:18 a.m. CST). This is Earth’s perihelion.
The word perihelion is from Greek roots peri meaning near, and helios meaning sun.
Earth is about 3 million miles (5 million km) closer to the sun in early January than it is in early July. That’s not a huge change in distance. It’s not enough of a change to cause the seasons on Earth.
On January 4, 2017, Earth at its closest point swings to within 91,404,322 miles (147,100,993 km) of the sun. That’s in contrast to six months from now, when the Earth reaches aphelion – its most distant point – on July 3, 2017. Then we’ll be 94,505,901 miles (152,092,511 km) from the sun.
http://earthsky.org/tonight/earth-comes-closest-to-sun-every-year-in-early-january
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