This is madness. Would you really want to miss out on away days at Bournemouth, Watford, Burnley, Boro and have to make do with Villa Park, St James'Park etc ?
What we experienced was called a "Haar" A sea mist or sea fret. That's why the areas 15-20 miles inland were fine and sunny. They're not uncommon on the south coast as well - I remember one on the day after the defeat to Palace in the play offs !
Big problem at the Amex is that they spaced the seats out too much and it never looks as full as other grounds. It doesn't help having the away support behind the goal either - creates a good atmosphere for the visiting team when full and no atmosphere for us when half empty.