  We present Kepler, Spitzer Space Telescope, Gemini-North, MMT, and Kitt Peak
observations of the L1 dwarf WISEP J190648.47+401106.8. We find that the Kepler
optical light curve is consistent in phase and amplitude over the nearly two
years of monitoring with a peak-to-peak amplitude of 1.4%. Spitzer Infrared
Array Camera 3.6 micron observations are in phase with Kepler with similar
light curve shape and peak-to-peak amplitude 1.1%, but at 4.5 micron, the
variability has amplitude $<$0.1%. Chromospheric H$\alpha$ emission is variable
but not synced with the stable Kepler light curve. A single dark spot can
reproduce the light curve but is not a unique solution. An inhomogeneous cloud
deck, specifically a region of thick cloud cover, can explain the
multi-wavelength data of this ultracool dwarf and need not be coupled with the
asynchronous magnetic emission variations. The long life of the cloud is in
contrast with weather changes seen in cooler brown dwarfs on the timescale of
hours and days.
