No, it's not an optical illusion – even the flowing waters of the River Aire in Leeds have succumbed to the big freeze.
With day-time temperatures remaining sub-zero, the river has frozen in parts of the city centre – a scene captured right by design company director Andrew Smith.
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He said: "I have lived on the riverside for 15 years and it is the first time I have seen it frozen across.
"People were throwing stones across just to check that it really had iced over.
"The river levels are quite low now so it is flowing pretty slowly but it's still remarkable to see it frozen."
While temperatures are forecast to rise a little as the week progresses, the icy spell looks set to continue.
The maximum in Leeds tomorrow, Christmas Eve and Christmas Day is expected to be zero, with a threat of snow showers in parts of Yorkshire.
East Coast train services were disrupted because of damage to overhead power lines near Peterborough and ticket restrictions were lifted to allow passengers to use other services.
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