Sunshine has repeatedly been found to increase moods, dampen negative moods and reduce tiredness.
People are happier and more helpful when the sun is out. A study showed that Minnesota diners tip more generously in sunny weather and American studies observed better daily stock returns on sunny days. Sunshine also affect our mental sharpness.
Temperature can affect our mind and behaviour separately of sunshine.
However, the weather will only influence us if we expose ourselves to it. In industrialised societies, people only spend 7% of their time outside.
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