Cold enough for water to freeze in seconds but still raining

I thought I was the only one with that particular complaint.

On a strange planet like this... Perhaps the freeze came from released freeze pockets underground and the rain from overheated volcano clouds from above.... I don’t know how far you are in the episodes but it becomes rather obvious that the freeze is quite local, and so not atmospheric (at least not primarily)

I did think it odd, but I can overlook it because we really don't know anything about the planet or what sorts of weather patterns or various properties it might have. We really only know how Earth is, so I guess with a fictional planet they have some room to do things that may not seem possible here.

The thing that really seemed to be some sort of mistake was in episode 2 when super math genius mom is talking about how they traveled trillions of light years. I rewound (is that the right word for going backwards on a DVR?) and that was what she said.

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You just described Connecticut weather perfectly.

I don't think it was rain, it was ice melted by the burning magnesium.

That is exactly what "freezing rain" is; the rain falls as liquid and freezes when it hits land.

Freezing rain is the name given to rain maintained at temperatures below freezing by the ambient air mass that causes freezing on contact with surfaces. Unlike a mixture of rain and snow, ice pellets, or hail, freezing rain is made entirely of liquid droplets. The raindrops become supercooled while passing through a sub-freezing layer of air hundreds of meters above the ground, and then freeze upon impact with any surface they encounter, including the ground, trees, electrical wires, aircraft, and automobiles.