Because different parts of the world/country receive different amounts of sunlight exposure. Besides different parts of the country lay on different elevations. AAAnd if the area is near a mountain, it will be protected from weather on the other side of the mountain. Different terrains=different weather.
It also depends on the countries location from the equator. The equator is the place where the sun hits the moat and its very hot. So the more north or south you go there would be colder climates in those countries.
