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The quarterly average of daily sun hours has fluctuated over the years in the United Kingdom. In each year, there is an overall trend of higher daily sun hours in the second and third quarter, which comprises spring and summer time in the UK. During winter and autumn, the first and fourth quarter of each year, average daily sun hours are almost half of those recorded during summer time. Between 2010 and the 2024, the quarter with the greatest sun hours was the second quarter of 2019, with 7.9 hours per day, whilst the fourth quarter of 2015 recorded a low of 1.8 hours per day.