Get your thermals ready!

AEMET have issued a cold weather warning about sub-zero temperatures:

http://www.aemet.es/documentos_d/enportada/20190108121136_p53tesp1.pdf

I've just done a Deepl translation which is good enough to get the gist of it:

From Wednesday 9, lead by north component winds, is expected the entry of a cold mass of polar air through the northeast of the peninsula, which will extend throughout Thursday to the rest of the peninsula and Balearic Islands. Its entry will cause a general drop in temperatures as well as frost in large areas. Although at the beginning of the episode it will be relatively humid, soon it will change to a drier character. The tender atmosphere will unstable in the Mediterranean area on Thursday to go to stability throughout Friday and Saturday.

From Wednesday until probably next Friday, the north winds will bring very cold air over the Peninsula and Balearic Islands. The cierzo will blow in the valley of the Ebro and the

Tramontana in the northeast of Catalonia and the north of the Balearic Islands with very strong gusts. During these days there will be widespread frost in much of the interior of the peninsula, not ruled out in the coast of the east peninsular. Temperatures drop below -5 ºC at night. In the plateaus and the environment of mountain systems, even locally below -10 º C. Daytime temperatures are not expected to exceed 5ºC in the interior of the northern half. The cold air is linked to the north wind.

No major rainfall is expected but some light snowfall may occur in the eastern Cantabrian and northern face of the Pyrenees. From Wednesday night onwards the level of snow is around 400 metres, and may even be lower occasionally. In the Balearic Islands and southeastern and Alboran coasts, weak rainfall is expected on Thursday, which will tend to go on Friday, with probable weak snowfalls above 300-500 metres in Mallorca.

It is very likely that daytime temperatures will begin to recover on Saturday while Nighttime temperatures will begin to recover on Sunday. The wind will still remain over the weekend in the Ebro and Balearic Islands, but tending to decrease. For the weekend and the first days of the the following week, stability is likely to continue with low cloudy and rainfall-free skies over most of the territory.

Your swimming pool might turn into a skating rink!