Natural gas spot prices at several trading hubs approached their record highs briefly during the week of February 14 amid significantly colder-than-normal weather that affected most of the Lower 48 states. The cold weather led to natural gas supply and demand imbalances. Natural gas production declined because of freeze-offs (temporary interruptions in production caused by cold weather) amid high demand for heating and power. At the benchmark Henry Hub, natural gas prices reached $23.86 per million British thermal units (MMBtu) on February 17, the highest real (inflation-adjusted) price since an Arctic blast on February 25, 2003. Henry Hub prices averaged $5.49/MMBtu in February, the highest monthly average since February 2014.