USA Today —
So what exactly is La Niña?
The La Niña climate pattern is a natural cycle marked by cooler-than-average ocean water in the central Pacific Ocean. It is one of the main drivers of weather in the United States and around the world, especially during the late fall, winter and early spring.
It’s the opposite to the more well-known El Niño, which occurs when Pacific ocean water is warmer than average.
Both are Spanish language terms: La Niña means “little girl,” while El Niño means “little boy,” or “Christ child.” South American fishermen first noticed periods of unusually warm water in the Pacific Ocean in the 1600s, the National Oceanic and Atmospheric Administration said. The full name they used was “El Niño de Navidad” because El Niño typically peaks around December.