This is number two on my list of favourite walks in Wales,but I prefer to do it in the opposite direction, Gyrn Wigiau to Dafydd and probably Pen Yr Ole Wen as well.
As you can see by the rather nice photographs,much of this walk is above the 3000 ft contour so choosing the right day is ever so important.
I do not do this walk as often as I should living so close,but when I do park in Gerlan the weather has to be high clouds, strictly no wind and set fair.
I am sure 99% of walkers who do this 12 mile walk have to do it whatever the weather,they may be lucky,but because of its length and extreme exposure it's a walk reserved for windless high cloud days.
Back in 1991 I was part of a group of eight walkers attempting a 3000s traverse,four of them were experienced Mountain Rescue leaders.
I will never forget the driving rain, high winds from every direction with simply nowhere to hide.
I've seen the Carneddau when all hell has broken loose,and that was 22 yrs ago, since then I have never been back for a repeat showing.
Battling high winds,drenched to the bone,feeling cold and miserable,and even if one wanted to take shelter,none is available.
If that's your idea of fun,then by all means traverse the Carneddau preferable in late Autumn,when the weather really shows its teeth,otherwise choose a nice day,because you will then be blessed by some of the best walking in southern Britain.