In November 2003 the islands experienced record breaking rainfall. St. Thomas experienced 18.39 inches of rain and St. John 18.91 inches. St. Croixâs highest rainfall was in September 1979 with an amazing 21.39 inches. Droughts are a larger problem because the islands are dependent on rain as a source of water.ainy months does not mean that there is continuous rainfall every day all month long, in fact most daily rainfall reports are below .10 inches. Rain showers are often short and typically occur early in the morning or at night. On a truly rainy day, it will rain off and on for the entire day.
1 Onchocerciasis is a parasitic disease that may cause blindness. 2  It occurs mainly in sub-Saharan Africa and a few isolated areas in the Americas (Brazil, Colombia, Guatemala, Mexico, and Venezuela) and is transmitted by blackfly bites.
Onchocerca volvulus causes a significant human disease known as onchocerciasis or river blindness in equatorial Africa and mountainous regions of northern South America and Central America. The bites of black flies cause different reactions in humans, ranging from a small puncture wound where the original blood meal was taken to a swelling that can be the size of a golf ball. Reactions to black fly bites that collectively are known as black fly fever include headache, nausea, fever, and swollen lymph nodes in the neck. In eastern North America, only about six black fly species are known to feed on humans. Several other species are attracted to humans, but they typically do not bite.