What change causes temperatures to drop during winter?

Temperatures drop during winter primarily due to the tilt of the Earth's axis. As the Earth orbits the sun, the northern and southern hemispheres receive varying amounts of sunlight throughout the year. In winter, the hemisphere tilted away from the sun experiences shorter days and lower solar radiation, leading to cooler temperatures. Additionally, factors such as increased cloud cover and snow cover can also contribute to the cooling effect during this season.