A Met Office weather warning for "dense and freezing" fog has been issued for parts of Wales.
High pressure is in control over the country this week, but with clear skies it will mean temperatures drop to below freezing overnight and fog patches will form. Forecast for the week here.
The yellow warning, which is in place from 7pm on Monday until noon on Tuesday, says: "Areas of fog, some of it dense and freezing, will develop during Monday evening and overnight, persisting into Tuesday morning in places.
"Visibility may dip below 100 metres in some locations. Fog will tend to lift into low cloud in many areas on Tuesday, though a few spots may stay foggy into the afternoon."
The areas of Wales covered by the warning include Caerphilly, Cardiff, Monmouthshire, Newport, Powys, Torfaen.
The Met Office forecast for Wales this week says: "A cold and frosty start Tuesday with fog slow to clear as sunny spells develop. Temperatures close the average for mid-January, but locally cold where fog persists. Maximum temperature 8 °C.
"A band of cloud and rain sinking south Wednesday with clearer skies following. Generally cloudy with sunny or clear spells both Thursday and Friday with overnight frost for some."
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