A: The more interesting answer pertains to snow falling at sea level, not on mountaintops. The most recent record is the snow that fell in Homestead, Florida in January, 1977. Homestead is located at 25 degrees, 28 minutes north of the equator.
Other Northern Hemisphere tropical locations include snow near Nanning, China in 1654; in Hong Kong in January 1893; and in Tampico, Mexico in February 1895. The snow in Nanning, China (close to the present day city of Beihai) was located at 21 degrees, 29 minutes north making this the southernmost snow on record.
Research found this answer through work completed by writer Christopher Burt, author of Extreme Weather.