Spiders generally change their webs once every twenty-four hours. If they make the change between 6 and 7 p. m., expect a fair night. If they change their web in the morning, a fine day may be expected. If they work during rain, expect fine weather soon, and the more active and busy the spider the finer will be the weather.
Spiders, when they are seen crawling on the walls more than usual indicate that rain will probably ensue. This prognostic seldom fails. This has been observed for many years, particularly in winter, but more or less at all times of the year.
If spiders in spinning their webs make the terminating filaments long, we may in proportion to their lengths expect rain.
When you see the ground covered with spider webs which are wet with dew, and there is no dew on the ground, it is a sign of rain before night, for the spiders are putting up umbrellas; but others say when the spiders put out their sunshades it will be a hot day.
Scorpions.
When scorpions crawl expect dry weather.
Tarantulas.
When tarantulas crawl by day, rain will surely come. (California.)
Wasps.
Wasps building nests in exposed places indicate a dry season.