What beneficial effect can frequent rainstorms common in late autumn have on sky clarity?

Answer

They can scour the particulates from the air.

Rainstorms are noted to be beneficial in late autumn because the rainfall physically washes atmospheric particulates out of the air, leading to a clearer view.

What beneficial effect can frequent rainstorms common in late autumn have on sky clarity?

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Why night skies are better in winter than during summer - YouTube

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