Natural-gas prices fell to an eight-month low on Tuesday, as a mild summer and growing stockpiles of the fuel discouraged investors. The latest forecasts indicate mild temperatures extending into what is usually the hottest period of the year, which would damp demand for natural gas used to generate electricity for air conditioning. Natural gas for August delivery was down 7.7 cents, or 2%, to $3.772 a million British thermal units on the New York Mercantile Exchange. It is the lowest price since Nov. 22, 2013. “The weather has not been particularly off the charts,” said Ed Kevelson, head of over-the-counter energy markets at brokerage Newedge USA, which is owned by Societe Generale. Even forecasts for August are beginning to call for lower-than-usual temperatures, he said. In addition to the lack of heat, continued gains in supplies are driving prices […]