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In simple terms, the prevailing winds that hit the UK arrive (mostly) from the west / south-west, which is from across the Atlantic Ocean, meaning in turn that they are usually carrying water.

Running north - south along the UK are the Pennine Hills - these cause winds arriving from the western directions to rise, thus consequently forcing them to drop the rain they contain, which in turn means that as the clouds then progress towards the east of the UK, they hold less water and rain is therefore less likely.

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12y ago

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