After a stretch of widespread cold, warming weather in some parts of the United States but a lingering chill in others led to a mix of gains and losses for natural gas spot prices during the three-day Nov. 30-Dec. 2 trading period. NGI’s Weekly Spot Gas National Avg. ultimately climbed 39.5 cents to $7.180.

Natural gas futures, meanwhile, flopped in dramatic fashion this week as the milder December outlook, along with robust production and soft LNG feed gas demand, pressured prices. The Nymex December contract plunged 31.2 cents as it rolled off the board at $6.712. January failed to gather much momentum as it took over the prompt-month position and ultimately stood Friday off 91.5 cents from the start of the week at $6.281.

“While January attempted to claw higher on Tuesday...