A dog stands under trees covered with heavy hoarfrost and snow on a bank of the frozen Yenisei River at air temperature about -14.8 degrees Fahrenheit, some 32 miles south of Russia's Siberian city of Krasnoyarsk, on Dec. 19.

A woman walks in the freezing outdoors in the Siberian city of Novosibirsk, about 1740 miles east of Moscow, on Dec. 19. The temperatures in Novosibirsk reached -20F today, but due to high humidity and strong cold wind, weather experts said it would feel more like -47F.

A snow plough removes snow from the road to the village of Fuerggli near St. Margrethenberg, Switzerland, on Dec. 19.

A woman on a skitour crosses the Grat towards the Chemi, a little more than a mile above sea level, above Mastrils in the Rhinevalley, Switzerland, on Dec. 19.