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Farmers in Zambia, especially those in the southern half of the country, have been warned to prepare for above normal rains in the next farming season resulting from a La Nina phenomenon. La Niña is the cooling of sea surface temperatures in the tropical Pacific, which occurs roughly every three to five years, lasting from six to 24 months. According to FAO, the chances of La Niña following an El Niño episode are higher on average — half of the El Niño events are followed by a La Niña — and typically it affects global climate patterns in the opposite way El Niño does. The intensity of the La Niña climatic phenomenon generally peaks between October and January.