The northern-hemisphere winter of 2019-20 was the warmest ever on land 6 years ago
Apart from anything else this could turn out to be extremely problematic in areas where the average temperature is around 0 degrees C. Lots of melting of snow (and then refreezing as ice)....
[1] https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/201...