When are the skies always clear in Seattle??

During the full moon.
This must have something to do with gravitational pull, the tides, dim comets in the sky, magnitude of the moon, or the amount of frustration of Seattle deep sky observers?
Again, the theory comes true.

Clear skies (Seattle) = [Sky] - [Clouds] + [Full moon] + [maximum natural light pollution]

Clear Sky Chart:





Moon Phase:



Full: March 10
Time: 4:09pm







Satellite:







Forecast:







Yep. Just another night indoors watching Netflix movies....