When Does British Summer Time Start 2025. At 1am on the last sunday in march, clocks 'spring forward' by one hour. The meteorological seasons consist of splitting the seasons into four periods made up of three.
The shorter days and cooler temperatures are a clear sign that autumn is in full swing. British summer time (bst) occurs on the last sunday of march and represents the phenomenon when the clocks go forward in spring by one hour and, in autumn, on the last sunday of.
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