March Second Warmest on Record, Global Warming Monitor Reports

The European Union’s Copernicus Climate Change Service highlighted that March 2024 marked the second-highest global sea surface temperatures, with a growing indication of an upcoming El Niño climate phase. Oceanic heat levels surged to near-record highs, as confirmed by the EU’s monitoring system on Friday. While the warmest March for ocean temperatures was recorded in 2024, this year’s readings are similarly extreme, attributed to the ongoing influence of El Niño conditions.

El Niño Transition Likely

Copernicus noted that current trends suggest a probable shift toward El Niño conditions, a phenomenon that typically intensifies global temperature extremes. This prediction aligns with a similar forecast from the World Meteorological Organization (WMO) last month. The transition is expected to follow a cooling La Niña phase, eventually leading into El Niño later this year, according to the organization’s analysis.

Record-Breaking Heat in the U.S.

In the United States, March 2024 became the most abnormally hot month in 132 years of records, per federal weather data. Shel Winkley, a meteorologist from Climate Central, emphasized the significance of this event in a

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: “The sheer volume of records this month is alarming, especially after a record-breaking snow year and the hottest winter on record.”

Climate Targets and Warming Trends

Following the 2015 Paris Agreement, nations aimed to limit global surface air temperature rise to 2°C. A more ambitious goal of 1.5°C was set to mitigate the gravest consequences of climate change. The Copernicus report reveals that temperatures have risen by 1.3°C to 1.4°C since pre-industrial times, underscoring the urgency of these targets.

Arctic Sea Ice at Historic Low

March also saw the Arctic’s sea ice extent drop to 5.7% below average, the lowest recorded for the month. This decline reflects the broader trend of diminishing ice coverage in polar regions, a critical sign of accelerating warming in both the Arctic and Antarctica.

Impacts of Warmer Oceans

Oceans act as the planet’s primary heat reservoir, absorbing most of the excess warmth from human activities. Their warming has cascading effects, including thermal expansion that raises sea levels and accelerated ice melt in polar areas. Additionally, warmer seas contribute to more frequent and intense storms, increasing rainfall in recent years.