Report: Record High Sea Levels in 2017

2017 set a number of the highest sea level records, according to the American Meteorological Society's newly-released 2017 State of the Climate report.
Global mean sea level in 2017 was the highest annual average in the satellite altimetry era (since 1993), measuring 77mm (three inches) above the 1993 average. Levels have risen for 6 consecutive years and in 22 of the last 24 years.

While the global average sea surface temperature in 2017 was slightly below the 2016 value, the long-term trend remained upward, with the last 3 years seeing the 3 highest annual average temperatures on record.

The year also including the highest global temperature for a non-El Niño year, lowest Arctic sea ice extent and highest greenhouse gas (carbon dioxide, methane and nitrous oxide) concentrations. Additionally, the year saw a wide swing of precipitation extremes, with some areas experiencing extended droughts and others notable precipitation, for example during Severe Tropical Cyclone Debbie in Australia and New Zealand and Hurricane Harvey in the U.S.