I had a cousin who made wonderful fudge. She ALWAYS said that
if she made her fudge on a cloudy/rainy day that it would never
turn out creamy. When she made it on a clear sunny day it was
perfect.
Don't ask me how the weather playing into that line of cooking fudge,
but it was a method she swore by for 40+ years and it worked for her.
The only fudge I had ever made was on the the back of the marshmellow
jar, so I am by far the LEAST experienced fudge maker.