How do spiders "forecast the weather"?

Because spiders are very sensitive to humidity changes in the air, if you see spiders stretching their webs, the rainy weather will clear up. If you see spiders pulling in their nets, it will become rainy. This is because there are many small spinnerets on the spider's tail, which are sticky and cold. When rainy weather comes, due to the high humidity in the air and a lot of water vapor, the water vapor is easy to condense into small water droplets in the spider's spinneret, so the spider feels difficult when spinning, so it stops spinning and closes the net. On the contrary, when the humidity in the air decreases and the weather improves, spiders can spin silk smoothly, so they can web insects.