In the Republic of Sakha, in northeast Russia, Reuters photographer Maxim Shemetov spent two weeks outside, documenting the punishingly cold winter weather. The coldest-ever temperatures in the northern hemisphere have been recorded in the Oymyakon Valley, known as the northern "Pole of Cold," where, according to the United Kingdom Met Office, a temperature of -67.8 degrees Celsius (-90 degrees Fahrenheit) was registered in 1933. Collected here are a few images from the frigid Siberian territory, where the average high temperature for this month was -40 degrees (same in both F and C).