I learned in elementary science class that the reason it’s colder in the winter is that the sunlight is coming in at an angle. We did an experiment with a piece of paper and a lamp that stuck with me.
However, it occurs to me that another reason that it’s colder in the winter is that there are simply fewer hours of daylight. There’s less time to heat up the ground/water/atmosphere, and more time for the heat to radiate out to space. I suppose that you could say that nighttime is just low angle light taken to an extreme.
Which effect dominates? Would a full 12-hour day of lower angle light be warmer than a 9-hour day of full light?