Niagara Falls has partially frozen for the second time this year, as North America suffers another extreme cold spell. The area experienced bitterly cold temperatures with a  low of -10 degrees Celsius overnight.

niagara
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blue ice
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The partially frozen falls are illuminated during a light showReuters
light show
A light show transforms ice formations into a fantastical landscapeReuters
frozen tourist
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frozen falls
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January Niagara
Niagara froze earlier this year as the 'polar vortex' brought record low temperatures to much of North America. The picture above was taken on January 8, 2014Reuters