One of the most disruptive climate cycles is El Niño, which is a warm and rainy period that occurs roughly every four years. Intervals between two to seven years are common. El Niño is caused by changing ocean currents off the Pacific coast of central South America. Locally, it affects the fishing industry, agriculture, and interestingly the guano industry. The effects, however, are far-reaching, and can be observed around the globe. By looking at the interactive chart, you can pinpoint which years, and even which days were particularly warm near the coast of Peru, at the Chiclayo airport.