Answer:
Latitudes, cloud cover, seasons and water vapor.
Explanation:
1) Latitude- The latitude plays an important role in controlling the incoming solar radiation.
2) Clouds- Clouds acts as albedo as it has the property to reflect solar light back into the atmosphere, thereby keeping the surface comparatively cooler
The main reason is that the USA is in the Northern Hemisphere & Australia is in the Southern Hemisphere. It has all to do with the tilt of the earth as it revolves around the Sun. Summer happens in the hemisphere tilted towards the Sun, and winter happens in the hemisphere tilted away from the Sun.
Sahara is the answer! hope this helps! :)
The line located at 0° latitude is the equator.
