Today, the season's lowest temperature so far was measured, and it was unusually early for these temperatures.

What Erik Sarri finds most striking when the thermometer goes down to minus 40 degrees is the silence that occurs.

- Everything stops.

There are no birds chirping, no wind, no scooters and you can hear no streams - it's just quiet, he says.

See what life is like in the unusual cold - and hear how quiet it gets from the cold in the video.