I tried to use "old" silicone on a project once. The same thing happened it only half cured. It was still wet to the touch after a day or so. I don't think the tube ever got cold or froze cause it was in the basement but im not 100% sure of that. (could have been in the garage over winter) I ended up removing all the silicone, buying a new tube and having to redo it all. The new stuff was tack free in a few hours for sure.
For me its worth the 5 dollars for a new tube when I start a new project. I will keep partial tubes but only for a short period of time now. Its not worth the headache IMO. Probably not what you wanted to hear.
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