If you thought the outer atmospheres of the giant planets: Jupiter, Saturn, Uranus, and Neptune are cold think again. You are not unfounded, models suggest a temperature of -73 C would exist, but Voyager found temperatures of + 700 C (1000 K)!
We now know the atmosphere of Uranus has changed from 750 K to 550 K in 20 years and since the year 2013 the temperature as rebounded by 50 kelvin per year.
Recent studies may have found an answer. Could it be storms?
The image is from the Voyager 2 spacecraft snapped these (left) true-color and (right) false-color images of Uranus in 1986. Credit: NASA/JPL