The ZEMA graph shows the North American natural gas spot prices on NYMEX for Henry Hub, Transco Zone 6, PG&E Citygate, and Chicago Citygates for January 2016. Units are in USD/MMBtu.
All hubs, except for Transco 6, remained at the same low price level throughout the whole period with a slight decrease held by reduction in heating demand. Prices at Transco 6 slid from over 6 USD/MMBtu, some of the four-year highest, to 1.2 USD/MMBtu reaching the lowest levels in the pack by the end of the period. Such a dramatic fall is explained by unseasonably warmer than usual weather.