Christmas Day to New Year’s Day in 2012 was the biggest week for both new device activations and app downloads for iOS and Android, says mobile app monetization company Flurry.

Between Dec. 25 and Dec. 31, Flurry estimated that users activated more than 50 million new devices and downloaded 1.76 billion apps. Christmas Day alone broke records for Flurry, with 17.4 million iOS and Android device activations and 328 million app downloads.

In the first few weeks of December, Flurry saw an average of 1.07 billion new iOS and Android app downloads each week. Comparatively, the week from Dec. 25 to Dec. 31 was up 65 percent at 1.76 billion apps downloaded, breaking the previous single week app download record set in the same week of 2011.

To no one’s surprise, the U.S. had the most app downloads from Dec. 25 to Dec. 31, with 604 million, which translates to a 34.3 percent share among the top 20 countries that attributed to the 1.76 billion downloads. China, where Christmas isn’t a legal holiday, came in second place, with 183 million app downloads. China coming in second shouldn’t be a surprise since Flurry recently predicted China to overtake the U.S. in iOS and Android install base by Q1 2013. The U.K., Germany and France ranked third, forth, and fifth, but all three countries had a significantly lower amount of app downloads versus the U.S. and China.

Flurry pulled data for the report from the more than 260,000 apps on iOS and Android devices running its analytics service. The analytics firm added that it can reliably detect more than 90 percent of all the iOS and Android devices, and that its analytics service is integrated into 25 percent of all iOS and Android apps downloaded on a daily basis.

Flurry believes that weeks where there’s a billion app downloads will likely become the norm in 2013, and that weeks with two billion app downloads will come during Q4 this year.