Neptune has the strongest winds in the solar system!
Neptune is always in the midst of a hurricane. Winds on the planet reach about 2,100km/h, making it the planet with the strongest winds in the solar system. Neptune also holds the record for the coldest planet (ever since Pluto got kicked out of the competition that is). At the top of it's clouds, temperatures on Neptune can dip down to -221.4 Celsius.
Scientists are scratching their heads over how a ridiculously cold planet like Neptune can have these ridiculously fast winds. One idea is that the cold temperatures and the flow of the fluid gasses in the planet’s atmosphere may reduce friction to the point that it’s easy to generate winds that move so quickly.