In the case of Camborne (manned) the issues are down to the 'fog in the vicinity' being reported as fog. (Camborne is close to an area prone to sea fog.) On one occasion Camborne recorded fog all day, when it was also the sunniest place in the UK (according to the MetO)


I had the same issue when I was holiday relief observer at Penmaen, Gower. I can remember an April day when most of the UK was cloudless and warm but it was a day of fog at 09h there - 500m from the Bristol Channel and the cliffs of Three Cliff Bay. A tiny area of advection fog was pouring up (if you see what I mean) the top of the cliffs and was visible for much of the morning. Not a bad place to have as a free holiday home though - for over 20 years, so I was happy to take whatever weather happened.

Julian