In meteorological terms, 1 June is the beginning of Summer in the northern hemisphere.
Meteorologists define northern Summer as the months of June, July and August; but astronomical Summer starts at the Summer Solstice - this year at 2051 UTC on 20 June, when the Sun reaches its most northerly latitude of 23º 26.1’.
The Sun will leave the northern hemisphere at the Autumnal Equinox - at 1243 UTC on 22 September, when it returns to the south.
And
British Summer Time (BST) will cease at 0100 UTC on 27 October, in
compliance with an EU directive of 2002, which stated that ‘Summer Time’
will be observed between the last Sundays in March and October, clocks
to change at 0100 UTC (this assumes that UK continues to comply with
that directive).
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