"Anglesey was 6 degrees warmer than Athens," she said
"You need a few key factors to get days like this in November.
" High pressure brings clearer, settled conditions and crucially sunshine. The wind came from the south east, blowing in warm air, known as a tropical continental air mass.
"When you get south easterly winds - areas in the north west of Wales will benefit from what's known as the Foehn effect. Warm air dries out as it hits mountains and hills - and warms up as it descends and reaches sheltered areas on the other side."
The highest temperature in November in Wales was recorded in November 1946, with 21.7C (71F) in Prestatyn, Denbighshire.
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