Since it’s the shortest day of the year you would think it would be the middle of the col season, as the days get longer after.
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Lets say you have a piece of metal and a blowtorch, When you put the blowtorch on the piece of metal it takes a few seconds to a few minutes to heat up to the point where its losing heat to its environment as fast as you’re putting heat in with the flame.
Now turn the torch off, the temperature likewise doesn’t instantly cool back down to the starting temperature, it takes a while.
The same is true of the earth and the sun, just on a much bigger scale. The coldest and hottest days are when the heat in and the heat out are equal. The rate heat comes in depends on the amount of sunlight received, the rate heat goes out depends on the current temperature.
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