Crude oil futures prices rose for the fourth day in a row Friday, reaching levels not seen since late November as traders pinned a 6 percent rise in the past week on supply snags and expectations of colder weather.

Light sweet crude for February delivery was up 34 cents to settle at $48.38 a barrel on the New York Mercantile Exchange. Last Friday, oil futures settled at $45.43 per barrel.

In London, Brent crude for February delivery slipped 6 cents to $45.15 per barrel on the International Petroleum Exchange.