Hydrocarbon Prices 07-12 Published December 30, 2012 at 912 × 663 in Natural Gas Price Drop, and Natural Gas Electricity!
Hi there - what is the source of data for US NG prices in the chart? It appears to be more granular than a monthly number.
EIA data. See: http://www.eia.gov/dnav/ng/hist/rngwhhdD.htm