Geography
El Niño–Southern Oscillation and Global Weather Patterns
Quick fact
A strong El Niño can temporarily raise global average temperatures by a few tenths of a degree Celsius, making it one of the largest natural influences on year-to-year climate.
Why this is interesting
A tiny change in the temperature of the tropical Pacific Ocean can cause floods in Peru, droughts in Indonesia, and weaker monsoons in India—so how does one patch of ocean affect weather everywhere?