[Last winter] clouds were extreme over much of the Great Lakes states, coinciding with extremely low ice cover over the Great Lakes, says Steve Vavrus, the Wisconsin state climatologist and director of the state's climatology office.
Seasonal affective disorder (SAD) is linked to changes in light, so cloud cover can have a significant impact on someone's mood, Dr Kia-Rai Prewitt, a psychologist at Cleveland Clinic in Ohio, said.
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