Marek Kučera 
Extreme late winter blast! Unexpectedly strong frosts hit at the weekend, 20.-21. March 2021 not only Czechia (-24,6°C: https://mkweather.com/czechia-with-extremely-cold-morning-246c/) and Slovakia (-18,4°C: https://mkweather.com/oravska-lesna-slovakia-184c-hurbanovo-the-warmest-station-82c-the-coldest-21-march-in-121-years-extreme/), but too Poland (the next article) or Austria (-16,8°C).
In Austria, more interesting such as minimum, were maximum temperatures.
In some basins and valleys with snow cover in altitudes below 1000 MASL, all-day frost with temperature maximum only -5,0°C was observed (Bärnkopf).
According to server https://uwz.at/de/a/fruehling-in-sicht, temperatures up to -16,8°C were reported from Austria on Sunday, 21. March from altitudes below 1200 MASL.
In Wien, Schwechat, minimum temperature on Sunday reached only -7,7°C and maximum temperature +1,9°C, with snowing or snow showers.
In Salzburg, all-day frost was measured (temperature maximum -0,8°C), Innsbruck reported maximum temperature only 0,1°C or Linz +1,0°C.
This coldwave was on Mkweather forecasted in previous period /https://mkweather.com/last-5-freezing-mornings-before-warm-summer-season-europe-extreme/; https://mkweather.com/continental-europe-reports-snowing-in-lowlands-and-basins-germany-131c-frosts-will-be-at-the-weekend-stronger/; https://mkweather.com/we-will-suffer-extremely-cold-mornings-until-24-march-in-parts-of-central-europe-yet-extreme-2021/; https://mkweather.com/europe-the-strongest-frosts-hits-at-the-weekend-20-21-march-in-valleys-in-czechia-and-france-20c-possible//.
Now, extreme warm weather is expected mainly in Western, but too in Central Europe /https://mkweather.com/paris-27c-at-the-end-of-march-is-possible-extreme-hw/; https://mkweather.com/summer-and-stormy-start-of-april-2021-in-the-uk-france-germany-and-benelux-extreme/; https://mkweather.com/the-first-summer-heatwave-25c-and-powerful-storms-on-cold-front-already-at-the-end-of-march-extreme-weather//.
Marek Sadowski 
