"Spider Rain" or "Angel Hair", as this phenomenon has generally come to be known as, doesn't really refer to the spiders raining from the sky (well if that would have been the case we would have used the idiom "it's raining spiders" instead of "it's raining cats and dogs", wouldn't we?).
Starting from the start, not only in Jamaica, but many regions with warm whether, especially tropical regions experience these uncanny hanging spiders and their webs in the sky.
We all know that spiders love warm and dark places and hence, they tend to make their burrows in grounds in regions like Australia. Jamaica, and Brazil. Now whenever they feel threatened on the grounds (for example at the time of floods) they weave their web up in the sky and live there.
Since more often than not, this web is barely visible, it seems like spiders are falling down like rain from the sky.
It is most likely to be happening at the time of what I mentioned earlier as "spider ballooning". It is a form of transportation that spiders use. This involves spiders to climb onto some high area and releasing silk to take off. They can travel through continents in this manner.
According to the scientists from the University of California and Ohio, it keeps happening all the time, but is noticeable only when it happens in bulk. Usually, there are only few spiders ballooning and hence the "Angel Hair" go unnoticed. But when many spiders are doing it simultaneously (which usually happens in the month of May and August), it seems like it's raining spiders.
The scientists claim that these spiders are not venomous and hence are harmless. They, however, may harm crops as the crops become so covered with web that they don't receive any sunlight.
These spiders may also disturb humans by getting entangled in hair and facial hair, or by crawling in numbers inside their home if left abandoned and dark for very long.
