Yes some areas in midt Jytland and Midt zeealand can be very cold.
Brande where Jan lives is one of the coldest area in Denmark.
The coldest areas is on the heighlands and just vest of the highlands in Jytland.
Exampel Bilund-nr snede-brande-isenvad-karup-viborg-holsterbro.
Just about 10-15 km from me it`s much colder than her where I live
The coldest temp here so fare have been -3,5 degreeds celsius
But just 15 km from here it has been - 11
John