Altnaharra, which is in the most northern region of the Highlands, reached the temperature shortly before 8pm, the Met Office said.
Forecasters said they are not expecting temperatures in the Sutherland hamlet to fall below minus 18C on Friday but there is a very small probability it could reach 19C.
Coldest UK January temperatures. (Photo: PA Wire)
Temperatures for large parts of the UK are set to fall again as the cold weather continues.
Towns and cities in Scotland could see minus 2C to minus 5C and the Highlands may reach minus 14C or minus 15C.
Coldest UK January temperatures. (Photo: PA Wire)
The average low in northern Scotland for this time of year is about 0.3C, while for England, overnight lows are around 1.5C to 1.6C.
Cloud coverage is keeping the temperatures from falling as low but it will still be chilly, Ms Hutin said.
Two skiers make their way along the B976 following the coldest night of winter so far, with an overnight low of of -14.5C recorded at Altnaharra. (Photo by Jeff J Mitchell/Getty Images)
Saturday is forecast to be cold too, and Ms Hutin said: “We’ve still got tonight to come, and tomorrow night could also be chilly as well.
“So another chilly night to come on Saturday, but then as we go into Sunday and into Monday, then we can start to expect temperatures to recover somewhat.
Looking ahead to next week, she said: “We’re saying it’s getting milder but by no stretch does that mean (temperatures) are going to be above average – it just will feel comparatively much more pleasant than it is at the moment.”
From PA
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