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The Southern hemisphere's temperatures in winter (jun-sep) aren't as cold as the northern hemisphere ones, so it makes sense the global average coldest temperatures are when the northern hemisphere is in winter .
For reference, only the Southern tip of south America gets snow in winter in the souther hemisphere
https://upload.wikimedia.org/wikipedia/commons/9/92/Annual_Average_Temperature_Map.png
Still don't see how it matters given the whole globe. I would think globally being closer to the sun would be all that matters.
I understand where you are coming from, but the context necessary for it to make sense is that you don't have to operate following the assumption that the seasons work the same for each hemisphere, one actually has a colder winter than the other, so that would affect the global average with a bias for the colder one. Think of it this way: the average winter temperature for the Southern hemisphere is not as cold as the average winter temperature for the northern one, so when taking them both into account for the global average, the temperatures in the north are going to skew the results (the Southern winter is not enough to offset the high temperatures of the northern summer, so the global average of the earth in its entirety is colder during the northen winter)
As to why that happens, well you are right that distance to the sun is one of the biggest factors for temperature, but it's not the only one. Global climate is a dynamic system, with a lot pf variables interacting with one another. Things like ocean currents and the amount of landmasses play a big role in regional climates. For example, thanks to the ocean currents Europe enjoys a milder climate than it would given its latitude. In this case the Antarctic cold is unable to go north due to being sealed by the Antarctic current, which encircles the continent. Also, the Southern hemisphere has a lot less landmass than the northen one, and water is a temperature regulator, so that affects the climate down here as well.
From what I remember (it's been over a decade since I read it), the southern hemisphere has much more water than the north.
Water is a great heat battery, especially deep oceans. And there's a gigantic mass of water in the south. So in the summer it stays cooler because that mass of water can store a lot of energy, and in the winter it stays much warmer because the oceans slowly releases the heat that they have stored.
All that water mass is essentially "dampening" the climate extremes. And since ocean water also slushes around + evaporates in much greater mass than the little water on land, heat also gets redistributed better than on land.
So in short: more water = cooler in the summer + warmer in the winter.