Crude oil output in the U.S. dropped by over 1 million barrels per day (MMbbl/d) in February, falling to the lowest levels since October 2017, according to a monthly government report released April 30.

U.S. oil production dropped 1.197 MMbbl/d in February to 9.862 MMbbl/d, shows a monthly report from the U.S. Energy Information Administration (EIA).

Production fell in top producing states North Dakota and Texas as well as in the offshore Gulf of Mexico, the report said.

February’s data is the first time that oil production has dropped below 10 MMbbl/d since January 2018, according to the agency. The output drop came as a freeze in Texas shut in some production, but declines were also seen in other major oil-producing states.

Meanwhile, monthly gross natural gas production in the U.S. Lower 48 states fell by 7.8 billion cubic feet per day (Bcf/d), the biggest monthly decline on record, to 94.8 Bcf/d in February, according to data in EIA’s 914 production report going back to 2005.

That gas output drop in February was due to severe weather that froze gas wells and pipes in Texas and other states in the central United States. It followed production increases during the prior three months.

Gross gas output peaked at 107.1 Bcf/d in December 2019.

In top gas-producing states, output fell 15.4% in Texas to 23.5 Bcf/d in February, the lowest in a month since February 2018, but held steady near a record high of 21.2 Bcf/d in Pennsylvania.

Other states that suffered big declines due to the February freeze included Oklahoma (down 16.7%), Arkansas (down 15.6%), Kansas (down 11.2%) and Louisiana (down 10.0%).