Over the years I've tried to learn and understand the various signs. As everybody knows, there are all kinds of ways the old-timers could supposedly tell. As much as I hate to admit it, I don't put much stock in them. And it's probable that they didn't either. I suspect the ones that did were the same ones that swore by the almanac.
IMO the wind and clouds are pretty good short term weather predictors. But things like spiders, wasps, winter hair on cattle, etc. are either not that accurate or too hard to judge. It does seem that an early or late killing frost might have some relevance.
Craig-TX