>>249
I have never heard the word "シビシビ".
Maybe it is a coined word, so I think no one can tell the concrete meaning.
If it has anything to do with the weather, it makes sad or lonely impression on me like a silent rainy day.
If I dare to use it, it's like this;ただ雨だけがシビシビと降っている.← but little weird
Nothing to do with the weather, I associate シビシビ with しびれる(be paralyzed/numbed). but it sounds childish.