From The Guardian
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That’s a really great visualization that immediately cuts off responses of “but el niño!”. No, this is historically atypical, even including periodic effects like that.
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But the southern Hemisphere has less landmass which can warm up during summer.
Water takes way more energy to increase in temperature than land does. There is a lot less land in the southern hemisphere. The global temperature difference between January and July is ~4-5°C