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The ice will form once the temperature hits zero Celsius or 32 F. however, it may not still freeze on pavement, even if the ambient temperature has reached this for two reasons.

a) There is something called latent heat. it takes some more cold before zero Celsius water turns into zero Celsius ice.

b) the earth below the pavement surface may be warmer than the ambiance, helping water not to freeze.

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13y ago
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11y ago

On unsalted roads, roads will freeze at 32 degrees Fahrenheit or 0 degrees Celsius. If the roads are salted, however, which is done to prevent ice in winter, roads can begin to freeze anywhere from 20 degrees Fahrenheit to -10 degrees Fahrenheit depending on the concentration of salt in the mixture used.

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15y ago

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Q: How cold does it have to be outside for the roads to ice up?
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