ShreyaThe Blood Rain, Kerala
This was a one-time occurrence but it is worth mentioning. It happened in the Indian state of Kerala and it is still baffling researchers. The town of Kottayam was rendered red when it rained like this. Some scientists have tried to reason out that it was caused by particles from the Arabian Desert or in some way linked to the erupted volcano in the Philippines. This happened on July 25, 2001.