When Is The Shortest Day Uk 2025. The winter solstice marks the first day of winter and is the shortest day and longest night of the year, when the earth’s tilt brings it to either the northern or the southern. This means that the length of the day during the winter solstice is eight hours, 49 minutes shorter than the summer.
The shortest day lasts seven hours 49 minutes and 42 seconds in london. In 2025 the summer solstice will occur on thursday 20 june at 21.51 bst (20.51 gmt).