The Met Office has warned that dense fog could disrupt travel plans this weekend.
A large part of the country will be affected by the fog and a yellow warning has been issued for Yorkshire.
A Met spokesman said: "Although not all areas will be affected, fog patches, some dense with visibility below 100 metres, are expected to develop during Friday night and persist well into Saturday morning.
"Some places will hang on to grey and misty conditions all day."
And it advises anyone driving that travelling in fog can be extremely dangerous as it can drift rapidly and is often patchy.
Fog can also affect flights because air traffic controllers have to increase the gap between planes that are landing, reducing the number of aircraft that an airport can manage.
It is also expected to be another very cold night with temperatures below zero early on Saturday.
Saturday will remain cold with temperatures only reaching 4c and they will plummet again in the evening and overnight into Sunday will drop to -2c.
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