How Many Seasons Are There In Argentina?

Four, just like in any other part of the world.

However,

Argentina is a very loooonggg country.  Therefore, in the South, you are going to see the types of weather changes you'd see in northern Canada for example.  Cold, harsh winters and bright, sunny, summers.

The northeast part of Argentina (around Iguazu falls) is a lot more tropical, and therefore you're going to see a lot less dynamic changes in the weather.

Keep in mind that seasons are opposite depending on which side of the equator you're on.  If you're in the Northern Hemisphere, then Argentina will be in the opposite season that you are in.