Winter 2017-2018 is not without ice day in any station in Czech Republic, Slovakia, or Poland. And Ice day (Tmax bellow zero) appeared much more south and west - in Great Britain, south France and Spain, coastal areas in Medditarean sea. There was pieces of ice in shallow long bays in Great Britain. T850 felt bellow -20 (Prague Libus -20.5 Prostejov -20.3 and Poprad Ganovce -20.5), ThetaE850 felt to -6.3 in Prague soundings.
The snowing was occurred far south too.
Only one winter was few stations in Czech Republic without Ice Day - winter 1974-1975.
Here is table with 8 stations - in the left stations without ice day during winter 1974-1975 and lowest daily maximum temperature for every month. Right collum is for stations with winter without ice day, but until 31.1.2018 (it was eight stations too, none station both of winters).http://www.infomet.cz/pix/text_big1517988972-1.jpg
25.2.2018 was ice day with Tmax bellow 0.0 in All Czech station.
Winter without ice day 1974-1975:
Plana u Ceskych Budejovic, lowest Tmax +0.1 in December
Solenice, Lowest Tmax in December +0.3
Borkovice, Lowest Tmax +0.5 in December and February
Caslav, Lowest Tmax +0.6 in December
Kolin, Lowest Tmax +0.4 in December
Pardubice, lowest Tmax +0.2 in December
Neumetely, LOwest Tmax +0.1 in February
Boletice, Lowest Tmax +0.4 in February
It can be ice day in November, March or even April, October, but this Winter was not.
Stations without ice day in winter 2017-2018 until 31.1.2018:
Dyjakovice, Lowest Tmax +0.1 in December
Dobrichovice, Lowest Tmax +0.4 in December
Kralupy nad Vltavou, Lowest Tmax +0.1 in January
Praha Karlov, Lowest Tmax +0.6 in December
Praha Klementinum, Lowest Tmax +1.9 in December
Doksany, Lowest Tmax +0.2 in January
Usti nad Labem, Vanov, Lowest Tmax +0.4 in January
Decin Lowest Tmax +0.8 in December.
There was no ice day in October-November on these stations. And for example Praha Libus has first day wit frost 26th November, and first day with frost (Tmin bellow 0) in center of Prague - Prague Klementinum, was 2nd December.
And there is in many stations record for latest first Ice day (Tmax bellow 0) in winter. It was in Doksany this winter 25th February. All stations have Tmax bellow 0 25th February.
There is table with stations without Tmax bellow 0.0 in winter 1974-1975 and this winter until 31.1.2018.
Source and article in Czech info-meterological web site:http://www.infomet.cz/index.php?id=read&idd=1517988972