Why are the days so short in December?

Answer 1

The northern hemisphere has less daylight because the northern hemisphere is leaning away from the Sun. The Sun then appears to be lower and does not spend as much time above the horizon. However, the Southern Hemisphere is leaning towards the sun, so it has more hours of daylight in December, and it is summer there. Mid-summer in the northern hemisphere, when the northern hemisphere is leaning towards the sun, means more hours of daylight, while the southern hemisphere has less, because it is leaning away and in its winter.