Ciro snowstorm mostly strengthened by human-driven climate change

Low pressure systems similar to that producing the December 2023 Ciro Snowstorm are locally 0-5 °C warmer and 2-10mm/day (i.e., 2-15 cm snow, that is 10-30%) snowier in the present than they have been in the past.

The December 2023 Ciro snowstorm was a largely unique event.

Natural climate variability likely played a role in driving the pressure pattern linked to Ciro snowstorm, but human-driven climate change have also contributed by increasing the temperature from negative values in the past, to values close to 0°C and enhancing the freezing rain and the snowfall associated with the storm.