Manufacturing activity fell to its lowest level since 1982, the Institute for Supply Management reported. Manufacturing data from China also pointed to a slowdown, marking declining demand from the world's first and second largest oil customers, The Wall Street Journal reported.

Crude oil prices dropped $5.68 per barrel Monday to $48.75. Heating oil prices fell 0.1105 cents to $1.6174 per gallon. Reformulated blendstock gasoline fell 0.1106 cents to $1.099 per gallon. Natural gas prices dropped 0.01 cents to $6.50 per million British thermal units.

At the pump, the average price for a gallon of regular unleaded gasoline was $1.82 Monday, down from Sunday's $1.825 a gallon, AAA said.