Further seasonal changes in Uranus' cloud structure observed by Gemini-North and UKIRT

► Uranus' zone at 45°N has brightened and counterpart zone at 45°S has faded during 2006-2010. ► H-band spectra (1.4-1.8 μm) have similar sensitivity to main cloud level and methane humidity. ► Clouds at 45°N, S are either at lower pressure (∼2 bar) or in areas of lower methane humidity. ► Methane humidity may vary from ∼20% poleward of 45°N, S to nearer 80% equatorward.