Antarctica sees record winter temperature of 15.4C amid unusual heatwave

Antarctica has registered its highest winter temperature on record, reaching 15.4 degrees Celsius (59.7 degrees Fahrenheit) on June 6 at the Argentinian Esperanza research base. This reading shatters the previous winter record by 2 degrees Celsius and is a staggering 20 degrees warmer than the typical temperature for this time of year.

While the Northern Hemisphere approaches summer, the Southern Hemisphere is entering winter. Instead of the usual snow accumulation that builds the continent's ice sheet, Antarctica is experiencing significant rainfall due to a heatwave. At the Esperanza base on Trinity Island, temperatures have remained above freezing for three weeks, a stark contrast to the usual average of -6.2 degrees Celsius for this period.

The record at Esperanza surpassed a previous high of 13.3 degrees Celsius set in 1998. Other Argentinian bases also reported record temperatures simultaneously. Luis Muñoz, a Chilean glaciologist working at King George Island, approximately 160 kilometers from Esperanza, described the landscape's transformation from predominantly white to brown, gray, and green as "everything melted." He noted that normally, 20 centimeters of snow and substantial ice would be present now, but instead, rain is melting the Collins Glacier, which should be growing with new snow.

British polar researcher Thomas Caton Harrison also observed "surprisingly a lot" of rain, linking it to rising global temperatures driven by climate change. While the last three years have been the warmest on record globally, Antarctica's unique weather patterns, influenced by ocean currents and wind, make pinpointing climate change's impact more complex. Harrison stated there is "credible evidence that climate change plays a role," but emphasized the need for long-term, consistent measurements to better understand Antarctica's climate. He added that the significant temperature fluctuations already affect the ecosystem, including penguin colonies.