The winter solstice is early Sunday across the northern hemisphere...with the official start to winter in the eastern time zone around 7:00 am. This means the direct rays of the sun pass over the equator...and then progress northward. This is the shortest time of the year...with increasing light and warmth after December 21-22. Of course there is a delay from the time the days getting longer until significant warmth is realized. The coldest averages on record for usually occur in January with typical high temperatures in the low to mid 50's...with overnight average lows in the upper 20's and lower 30's.
It remains to be seen if our true winter like weather is behind us...since November was around 4 degrees below normal with snow occurring twice in one week. For the short term expect up and down temperatures through Christmas with potentially warm and wet weather for Christmas Eve and Christmas Day. No snow is in the forecast.