On a sunny day in winter, why does it appear to be much brighter outside on a day when there is a snowpack on the ground as opposed to a sunny winter day with no snowpack?

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The Answer of On a sunny day in winter, why does it appear to be much brighter outside on a day when there is a snowpack on the ground as opposed to a sunny winter day with no snowpack?

On a Sunny Day in Winter, Why Does It Appear