Least this conclusions we should read from ensemble forecasts for Stockholm, where will persist Siberian air masses most of the time following minimally 3 weeks.
Similar conditions are forecasted for London and Warsaw, while southern parts of Europe won´t be so luckly such as northern and western half of Europe.
According to last runs of GFS, from 27.1.2021 12Z and 18Z, frosts only -17/-22°C should surprise Alpine and Carpathian basins and valleys between Sunday-Tuesday, 31.1. - 2.2. 2021, then will come next short warm spell, but...
Already following weekend, 6.-7. Feburary should Siberian air shift over Scandinavia, Poland and Germany up to British Island, Benelux, France and Spain, with promised strong frosts.
However, Wednesday´s outputs of main run are again little warmer than previous, with -20/-25°CC probability in Alpine and Carpathian basins, maybe -20°C in northern Poland, and around -40°C in central Scandinavia, too.
Approximately 1/3 of runs however for period between 5.-20. Feburary expect for Warsaw temperature in 850 hPa slightly below -15°C, what should mean 33% probability of even stronger frosts during the period.
After 20. February it looks like early spring preliminary, although in Iberian Peninsula are expected summer days (above +25°C) already during the next period.
Forecasts will be furthermore updated and Mkweather brings every day fresh news.