I wonder where they get these figures from according to BBC Wales Website, Swansea gets around 43 inches of rain a year at Mumbles weather station, so I doubt the accracy of these "survey" figures. I wonder if the Met Office has official statistics of rainfall, so a genuine comparison can be made. If it were we probablywould be wet, and not as much as that survey suggests.
And the statment that Northerlies are blocked out by the Hills isn't completly true, we often get snow from Northerlies and in particular North Westerlies.
I won't argue about the windy bit though.