Southern Hemisphere
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Thank you, Bailey! That's a good question - yes, El Nino and La Nina do have impacts in the Southern Hemisphere winter. The teleconnections to the Southern Hemisphere regions work in basically the same way as they do in the Northern Hemisphere, though El Nino and La Nina tend to be weaker in austral winter than in boreal winter. This previous post shows some of the typical impacts of El Nino during austral winter (you can reverse the sign of the impacts for La Nina). In an analogous way that El Nino and La Nina influence North American climate through the Pacific-North American (PNA) pattern, El Nino/La Nina can excite a similar pattern in the Southern Hemisphere called the Pacific-South American (PSA) pattern.