What do you think is the COOLEST planet in our solar system?

Earth is fascinating due to the presence of life, of course, but if I had to pick another it would be Jupiter.

It's huge and along with its moons looks like a mini-solar system within a solar system. It has wild weather bands and spots that last for centuries and even amateur astronomers can see from their backyards. It also has several moons which are themselves interesting (Europa is thought to have water and enough oxygen for life) and they're big enough for backyard viewing as well. We've even seen a comet smack into the planet.

Jupiter I know most people think it's a planet or gas giant, but it's so much more the outer surface that we see from earth is really a protective atmospheric shell that contains a small star for a sun with 6 orbiting planets that's the reason that Jupiter puts out more heat / energy than it receives from the sun it's a mini solar system inside our solar system that's why it's the coolest

Mercury

Uranus

Saturn. Because of the awesome rings. (I assume you do not say coolest to mean coldest.)

At this time, Earth...I'm freezing my butt off right now. Three days ago it was in the 90's - this morning it was 37.