Even colder

It was an unusual (for winter here) clear sky last night so it got very cold. It was -18.5 C at the Luebeck airport this morning and -19 C in Selent. The coldest I've seen it here. The big lake froze over as far as the eye can see. People were way out skating on it and police were going around yelling at them to get off. It was sunny and clear and cold all day today!