you need to insert a script that would generate sort of a random number and pull from its selection.
along these lines
my $a = quest::ChooseRandom(1, 2,3,4,5,6,7,8,9,10);
then you check with If statement which $a was choose, and set weather accordingly (like 1 to 5 - no weather, 6-8 rain, 9-10 snow)
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