That's why all things considered, the farther north from the equator you live, the greater the risk you'll have some degree of winter depression.

If your mood gets worse as the weather gets chillier and the days get shorter, you may have "winter depression."

Several treatments have been shown to improve seasonal winter depression.

Viral infections are another common cause of winter depression.

Researchers are still far from agreement about the precise cause of winter depression, and, they admit, the syndrome may have more than one cause.

Perfectly fits in the winter atmosphere and makes you smile despite winter depression.

Studies on light's effects have been increasing since the 1980's, when seasonal affective disorder, or winter depression, was first identified.

Although cold weather is most dangerous for elderly people, they are least affected by winter depression, he said.

This "may be a clue to understanding the causes and treatment of winter depression," Oren explains in a press release.

But far beyond that, the summer sun may help you avoid winter depression.