The windward side of a mountain experiences lower temperatures than the leeward side.

Here's why:

* Windward side: This is the side of the mountain that faces the prevailing wind. As air rises up the mountain, it cools and condenses, leading to precipitation. This cooling effect results in lower temperatures on the windward side.

* Leeward side: This is the side of the mountain that is sheltered from the wind. The air that descends on the leeward side is dry and warm, due to the release of latent heat during condensation on the windward side. This results in higher temperatures on the leeward side.

This phenomenon is known as the rain shadow effect.