Once again you'll have to rely on my faulty memory, or look up the past temperatures. There are no really warm spots of 30 C or more. I haven't seen the oceans so cold.
This isn't something that can happen overnight, as with sunspots, this is deep-seated and a regular cycle. What I can't figure out is if the oceans are a heat energy storage system or they merely divert heat from north to south. For that you need a history of total volume measurement.
With the heat storage model, some cycles store heat so that both the northern and southern hemispheres are cold. With diversion, the south gets all the heat from the north. We don't know what happened to the south during ice age cycles. Maybe somebody can find out.
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