WHY can you see farther from a mountain in winter than in summer?

It’s all about refraction – the curvature of the path of light as it moves through layers of air of varying density. This causes the light to twist slightly, allowing you to “look beyond the horizon”.

In summer, refraction at the horizon is about 0.5°, but in winter the cold air becomes denser and refraction increases, rarely reaching 2°. Then you can see more distant objects.

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