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Rainfall
As a rule of thumb, average rainfall tends to decrease, and average temperature tends to increase, as you travel from north to south.
The county of Essex is one of the driest in the British Isles, with an average annual rainfall of around 600mm (24 inches), although it typically rains on over 100 days per year. In some years rainfall in Essex can be below 450mm (18 inches) -- less than the average annual rainfall in Jerusalem and Beirut.
The Lake District and western Highlands of Scotland are the wettest areas, with over 2000mm (78 inches).