I'm from Australia where we don't have so many kinds of precipitation. I'm familiar with these:
As I understand it, sleet refers to frozen rain but I'm not totally familiar with it. Right now I'm not in Australia but Georgia, the former Soviet republic. And at the moment it's raining but not just rain. There's also some mushy snowflakes falling. I've never seen this before and wonder if we even have a word for it in English. Would it be referred to as sleet after all? It's 2 degrees above zero centigrade now so frozen rain seems unlikely.