This was a rise of 54% on the BBC America ratings for 2011's The Doctor, the Widow and the Wardrobe.
These great figures make it the channel's second most-popular programme, being beaten only by Asylum of the Daleks, which achieved 1.555 million viewers in September.
BBC America's general manager, Perry Simon said:
It feels exactly right to be ending the year on a ratings high with Doctor Who. The show has really delivered for us this year on every level. Cinematic scale, superb acting, cracking storylines, and a growing band of dedicated fans – we can't wait for the next series in spring 2013.According to TV By The Numbers, The Snowmen was the 70th most-watched programme of the day on and 17th in its transmission slot.
Meanwhile, Doctor Who has also been voted TV Guide cover of 2012.