If you're going by what Mother Nature has brought us, winter started a couple of months ago. However, officially it still is fall.
Winter begins tomorrow night at 10:19 PM, which is the official time of this year's Winter Solstice.
Tomorrow is also the shortest day of the year with only 9 hours and 15 minutes of daylight.
The Winter Solstice is the moment when the Earth's axis (in the Northern Hemisphere) is pointed furthest away from the sun. This graphic below shows a visual representation of the Winter Solstice, as well as the Summer Solstice and the two equinoxes.
Days will grow slowly over the next few weeks, adding just seconds of additional daylight to each day, but by the second week of January, we'll be adding a minute to each day.
We'll continue to grow the amount of daylight we'll add to each day as we head throughout the rest of winter and into spring, and by the first day of Spring in March, we'll have almost 3 additional hours of daylight compared to tomorrow.