The automakers will report December vehicle sales on Wednesday, Jan 3rd.

Note: There are 26 selling days in December 2017, there were 27 selling days in December 2016.

From WardsAuto: December U.S. Forecast: Market Will Hit 17.5 Million SAAR

The WardsAuto monthly forecast is calling for 1.57 million light vehicles to be delivered over 26 selling days in December.

…

The forecast 17.53 million-unit seasonally adjusted annual rate is above November’s 17.40 million, but below December 2016’s 18.05 million.

emphasis added

Sales had been below 17 million SAAR (Seasonally Adjusted Annual Rate) for six consecutive months, until September (18.5 million SAAR), October (18.0 million SAAR), and November (17.4 million SAAR) when sales spiked due to buying following Hurricane Harvey.

Even with the pickup in sales over the last few months, sales were down 1.5% in 2017 through November compared to the same period in 2016.