Under the sea ice during the Arctic’s pitch-black polar night, cells power photosynthesis on the lowest light levels ever ...

A polar day is when the sun does not set and stays above the horizon for an extended period, while a polar night is when the sun never rises above the horizon. These phenomena are ...

Polar air masses from Siberia are forecast to ... Temperatures on Sunday night will be in the teens across the same region. If it snows, icy spots could linger into the Monday morning commute.

Wind chill readings will range from -15 to -25 degrees. Actual air temperatures Sunday night will dip to a low around -2, while highs Monday afternoon will peak toward 10 degrees. However ...

The words of Gill Punt, who had more reason to worry than all other runners in the polar night marathon in Norway, since she was about to run it dressed as a polar bear. But the PE teacher ...

RELATED: Everything you need to know about the polar vortex bringing extreme cold ... snow that will let up Sunday and return Sunday night. Barjenbruch said people working outdoors this weekend ...

but temperatures will remain below freezing through Monday night. RELATED: Everything you need to know about the polar vortex bringing extreme cold to Colorado A high of 14 was forecast Saturday ...