Sub-zero temperatures coupled with snowfall have claimed four more lives in Poland, raising to 30 the death toll since December 1, the interior ministry said Wednesday.

Just two weeks into December, the season has already proven deadlier than the entire month last year, when 19 people were recorded to have died, the ministry said.

It called on the public to look out for the homeless and other vulnerable individuals, who traditionally make up the bulk of Poland's winter victims.

An early cold snap in October already claimed 15 lives in Poland, while five others died in November.

Last year, some 200 people died of hypothermia in Poland, a nation of 38 million.

The majority were homeless, and many of them were drunk.