The planet whose temperature falls between 90K and 700K is Uranus.

Here's why:

* Uranus's average temperature is around 59K (-371°F). This makes it the coldest planet in our solar system.

* Uranus's temperature can vary significantly depending on location and time. Its atmosphere experiences extreme winds and storms, leading to temperature fluctuations.

While other planets like Neptune, Saturn, and Jupiter are also incredibly cold, their average temperatures are slightly warmer than Uranus.