The “freezing level” is not the height at which snow turns to rain as Ben Rich states in this BBCBBC The British Broadcasting Corporation (BBC) is the national broadcaster of the United Kingdom, based at Broadcasting House in London. It is the world's oldest national broadcaster, and the largest broadcaster in the world by number of employees, employing over 22,000 staff in total, of whom approximately 19,000 are in public-sector broadcasting. Weather video, but the lowest height above mean sea level where the air temperature is 0°C. It’s defined by a specific temperature 0°C and not the change of state of solid into liquid. I don’t see why it proves so difficult to explain.