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Atmospheric Composition
As with other gas giants in the solar system, both planets have atmospheres primarily composed of helium and hydrogen. Approximately two percent of Uranus' atmosphere is methane, including methane crystals in the outer layer clouds of ammonia and water. Methane clouds drift through Neptune's outer cloud layer.
Weather Patterns
Large dark storms similar to Jupiter's Great Red Spot appear and dissipate within Neptune's atmosphere and seasonal changes have been observed over the course of both planets' long orbits.
Wind Speeds
Wind speeds in Neptune's atmosphere reach 700 mph (300 m/s) and a group of white clouds dubbed "Scooter" race around the planet in 16 hours. Winds on Uranus are milder but still robust ranging from 90 to 360 mph at mid-latitudes.