It is officially the hottest winter day on record, after temperatures hit 20.6°C in Trawsgoed in Ceredigion.
It beat the previous record of 18.6°C set in in Powys in 1990.
It comes after a weekend of record-breaking winter sun - Aberystwyth saw temperatures of 19.1°C on Sunday.
Temperatures are more than double the average for the time of year, with February usually recording temperatures of about 7C.
The soaring temperatures will come as a welcome relief as half-term begins across Wales.
But after the new February record was set, former Green Party leader Caroline Lucas tweeted: "This isn't some jovial Guinness World Record. This is a climate emergency. Ministers must get off their sun loungers and introduce a #GreenNewDeal."
Just this time last year, Wales and the rest of the UK were preparing for the 'Beast from the East'.
After The met Office issued a red weather warning for parts of south east Wales, a blanket of snow caused havoc across the country.
St Athan saw 55cm of snow and temperatures dip to as low as -9.4C in Tredegar - the lowest overnight temperature since 2001.
More than 1,000 schooled, flights were cancelled and roads closed.
The chaos even left shoppers emptying the supermarket shelves. People were left struggling to buy bread and milk from shops across Wales.