Why do tropical zones have a hot and humid climate year round and polar zones have a cold climate year round?

Tropical places are hot because the humidity coming from the moisture of the plants and water are heated by the sun on the top layer of the tropical zone. The climate varies little in rain forest. There are five layers in the tropic trees so it's so thick that barely any light come through. This is also why vines grow up the trees so they can reach the sunlight to get nutrients. Also, the tropics are near the equator and that also causes the heat. The polars are cold because they barely get any sun heat to melt the snow or warm it up. The polars are melting due to certain chemicals and gasses in the atmosphere. also known as global warming. Hope that was helpful!

In Austria, this is the climate year-round Summer- is the wettest with heavy rainfall and thunderstormswinter- you can say that winter in austria is just plain cold.

The name may be in importnce  to them