Which phenomenon is so called becoz it is usually noticed around christmas time ?

Question

in the pacific ocean off the west coast of south america ?

Answer 1

Fishermen off the west coast of South America were the first to notice appearances of unusually warm water that occurred at year's end. The phenomenon became known as El Niño because of its tendency to occur around Christmas time. El Niño is Spanish for "the boy child" and is named after the baby Jesus.