Lingfield's National Hunt fixture on Monday has been abandoned due to standing water on the track.
Course officials called an 8am inspection for Sunday to assess conditions after persistent rain for a number of days.
A further 5mm fell during Saturday, with more overnight and another 5-10mm is forecast throughout Sunday.
Clerk of the course George Hill posted on Twitter: "Mon 22 Jan ABANDONED. HEAVY (Standing water & false ground in back straight). 1mm overnight (5mm total yest). F'cast: 5-10mm rain today with no chance of any improvement."
Wetherby's National Hunt meeting on Tuesday must survive an 8.30am inspection on Monday. The going at the Yorkshire course is currently heavy, soft in placs but parts of the course are frozen with standing water in places.
As with much of the country it was sleeting at Wetherby on Sunday and 5mm of precipitation was forecast for the rest of the day.
Snow and sleet also hit Chelmsford on Sunday and delayed racing by half an hour, with the first race not until 2pm. Snow settled on the All-Weather surface but groundstaff worked hard to remove it.
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