I have no idea how you would do that. I am still finding difficulty after all this time, tbh most of the members just post charts and say 'oh this would be brilliant for cold or warmth' but they don't explain why. I don't know what a cloudy or clear high would look like i'm just basing it on experience on where I live and usually here the azores high will bring cloud and low diurnal ranges. As for what makes it a cloudy high? Not got a clue but i'm going to take a wild guess and say that the moisture from the atlantic (azores high) produces high humidity which is condensed into clouds and since the sun is not strong enough the cloud just stays for days on end.