Clear ice

  Clear ice refers to a solid precipitation which forms when air temperature is between 0 °C (32 °F) and -3 °C (27 °F) and there are supercooled, relatively large drops of water (from freezing fog). A rapid accretion and a slow dissipation of latent heat of fusion favour the formation of a transparent ice coating, without air or other impurities. A similar phenomenon occurs when freezing rain or drizzle hit a surface and is called glaze.

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Clear ice, when formed on the ground, is often called Black ice, and can be extremely hazardous.

Clear ice differs from hard rime because this one is more homogeneous; like rime, however, clear ice deposits preferentially on branches and overhead lines, where is particularly dangerous due to its relative high density.