I actually ran the entire satellite loop for the summer of 2010 and did so again recently. There really weren't that many totally cloudy days from June through early September. There were many days with marine layer through the morning and sunny in the afternoon. Not sure how that was calculated but the satellite loop tells me it wasn't that bad. Sounds like coast barely ever saw sun and almost every morning was cloudy in Seattle but there was afternoon sun.
Saw this from Cliff:
August 11, 2010
Finally...Extended Sun and Warmth
There have been a lot of complaints about the weather lately.
Sure, there has been practically no sun along the coast. Yes, Seattle has had a record-breaking stretch of morning clouds. Sure, most days have not come close to the normal afternoon highs.
Not wet, but definitely cloudy. I remember some article about how Seattle went from one of the sunniest summers in history in 2009 to one of the cloudiest in 2010.
The Clausius Clapeyron equation shows that global saturation vapor pressure increases 7% for every degree C of warming. Combining that with the global energy budget equation literally says that global mean precipitation has to increase by 1-2% for every degree C of warming. It has to, fundamentally, increase.
The question then is how that increase is distributed globally. If circulation remains the same, it all goes to the areas where it is already raining. If the circulation slows down, then no, wet won’t necessarily get wetter regionally. Climate models have shown some increased precipitation along with slowing circulation.
So, yes, if the climate models are wrong about the circulation changes then “wet gets wetter” won’t apply in some locations. But you would be crazy to think that the trend won’t largely hold overall, even if there are some exceptions.
Yeah, if you just look at one station the last decade has averaged a few inches above the long term mean. But then as recently as 2000-2013, we saw a decade+ period average well below the long term mean. Before that the 90s were a much wetter decade.
Point being, I'm not sure the most recent "trend" really represents much long term.