Natural-Gas Prices Are Still Swinging

Mild autumn weather is allowing domestic natural-gas stockpiles to build before furnaces get fired up, allaying fears of winter shortages and sending prices on big day-to-day swings.

Natural-gas futures for December delivery fell 7% to $4.791 per million British thermal units on Friday. It was the 14th time over the last 35 trading days that prices moved more than 5% up or down. On Thursday, the price climbed 5.5%. On Tuesday, it was dropped 8.3%.