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El Niņo and La Niņa refer to the warming and cooling of surface waters over the central and eastern equatorial Pacific Ocean which affect the atmospheric circulation worldwide and regional climate in many parts of the world. Statistically, the influence of El Niņo and La Niņa on the climate of Hong Kong when compared to normal condition can be summarized below:
El Niņo
1. Generally wetter winter (Dec-Feb) and spring (Mar-May);
2. Unlikely to have tropical cyclones affecting Hong Kong before June.
La Niņa
1. Generally cooler autumn (Sep-Nov) and winter;
2. Likely to have more tropical cyclones affecting the territory during August-October.
Further details are as follows:
1. What are El Niņo, La Niņa and ENSO?
2. Latest status
3. Impact on the climate of Hong Kong
4. References
Note:
1. Normal condition refers to the situation with neither an El Niņo nor a La Niņa in place.
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