Heat wave in the arctic - in winter

Under normal circumstances, CFS Alert, which is just now seeing the sun peek above the horizon for the first time since late October, has winter temperatures averaging between -25C (-13F) and -35C (-31F).

On the weekend of 24-25 Feb 2018, the temperature got up to 6C (43F). This isn't rare, it's damned near impossible. But due to climate change, Alert's weather is seeing drastic anomalous temperature swings.

For reference, 6C is a typical July day high temperature.