Formation
Drizzle is formed in low level stratus type clouds when vertical motion is weak. It consists of relatively small drops, light in nature. Freezing drizzle generally occurs when drizzle forms in an airmass at below freezing temperatures but warmer than -10 °C (12 °F). At such a temperature, the water droplets stay supercool as there are few ice nuclei to change them to ice crystals (see freezing rain). In winter arctic conditions it can happen at even lower surface temperatures as the air is even cleaner.
Read more about this topic: Freezing Drizzle
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