Climate in Llandudno & North Wales Coast
Top temperatures in Llandudno and Coastal North Wales due to a rare atmospheric effect! The highest United Kingdom temperature readings at the end of October 2009 were recorded in a very confined zone; along the north welsh coast between Bangor and Llandudno. Figures from this lowland stretch suggest that the mercury here reached 21C (70F); pleasantly warm in July, let alone at the end of October.
The “fohn effect” has been responsible for the UK’s highest temperatures in November, December, and January. Eight times in the last century the mercury climbed above 17C somewhere in the UK during January. Amazingly, all eight occasions occurred along the north Welsh coast. The highest November temperature ever recorded in the UK was on the North Wales coast.
This district, on the lee side of the Snowdon massif, benefits from a process called adiabatic compression, more commonly known as the “fohn effect”. This process occurs when air from well above the level of the mountains descends to much lower levels and the higher pressure near sea level compresses the air, resulting in a rise in temperature. The fohn wind is an Alpine phenomenon that brings abnormally high winter temperatures to the valleys of Switzerland and Austria.
Similar winds are found in many other parts of the world where warm, moist winds cross mountain ranges. The vent d’autan is a warm wind of western and central France, where the Pyrenees and Massif Central provide the mountain the mountain barrier; the livas blows across the Balkans to northern Greece and Bulgaria. In North America, the Chinook blows down the Rockies’ eastern flank.
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