Oklahoma City has broken its record for most 100-degree days in one year, as the temperature reached 101 degrees at Will Rogers World Airport Monday for the 51st time this year.

The previous record, set in 1980, was 50 days. The record is one of many to fall this year in an unprecedented heat wave. The state also set a record in July for the hottest average monthly temperature on record for any state in the U.S.