Here's why:

* Earth's Tilt: The Earth is tilted on its axis at approximately 23.5 degrees. This tilt is the primary reason we have seasons.

* Sun's Rays: When a hemisphere is tilted towards the sun, the sun's rays hit that hemisphere more directly. This means the rays are concentrated over a smaller area, leading to:

* Warmer temperatures: Direct sunlight carries more energy, making the surface warmer.

* Longer days: The hemisphere tilted towards the sun experiences longer days and shorter nights.

Let me know if you have any other questions!