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Wikipedia:
Sleet refers to two distinct forms of precipitation:
Rain and snow mixed, snow that partially melts as it falls (UK, Ireland, Australia and Canada).Ice pellets, one of three forms of precipitation in a US-style "wintry mix", the other two being snow and freezing rain (US).The latter is referred to as sleet mainly by the United States National Weather Service. In some countries, such as Canada and the UK, sleet is not a recognized meteorological term. Environment Canada will call it a mix of snow and rain or "a wintery mix" and will use the term "ice pellets" to describe frozen, granular precipitation.
