weather December 21, 2023 10:51 am Winter Solstice Explained Dec. 21 is a big day on the astronomical calendar for North Texas, the official start of winter. Meteorologist Kevan Smith explains why it’s the shortest day of the year. Wake Up to Something Good 2:29 NBC 5 Forecast: Muggy pattern with storm chances later this week 2:27 NBC 5 Forecast: Very warm summer-like pattern, storm chances return by mid-week 2:33 NBC 5 Forecast: Very warm summer-like pattern, storm chances return by mid-week 2:29 NBC 5 Forecast: Starting the week with more heat and humidity 2:29 NBC 5 Forecast: Starting the week with more heat and humidity