Brent crude, used to set prices for international varieties of crude, fell $1.55 to US$106.40 a barrel in London on Friday, down four per cent for the month.
Meanwhile, the severe cold sent the price of heating fuels soaring.
Natural gas, used for heat by almost half of U.S. residences, rose 17 per cent for the month to US$4.94 per 1,000 cubic feet. The price hit a four-year high of US$5.56 per 1,000 cubic feet on Wednesday.
In other trading Friday trading on the New York Mercantile Exchange, wholesale gasoline retreated four cents to US$2.63 a U.S. gallon (3.79 litres) and heating rose six cents to US$3.28 a gallon.
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