When Is Winter Solstice 2024 Uk. By the meteorological calendar, the first day of winter is always 1 december; It marks the northern hemisphere’s shortest day (first day of winter) and southern hemisphere’s longest.

Saturday, 21 december 2024 the winter solstice occurs at 09:23 the days become shorter as a result of the earth tilting away from the sun (at least in one hemisphere at a time). So, astronomically, the winter season won’t start until then.