"For people without shelter, the cold months become an existential challenge. Where to go when the temperatures drop below zero, when it rains or snows and you have no roof over your head?" said Koch on the radio station rbb 88,8 on Saturday.
Just as the pregnant Mary once desperately searched for shelter with Joseph on the run, there are women and men today who don't know where to go.
"They too are turned away, overlooked or even marginalised."
Koch called on radio listeners to remember what it was like when Mary and Joseph were left alone in their distress and ultimately had to give birth to their child in a stable.
"A child who became the saviour for us all. Who would have expected that two people - outwardly scarred by their flight and life on the streets - would carry such a treasure that could change the world?"
Caritas service on 6 December
The Archbishop announced that a Caritas service would be held in the reopened St Hedwig's Cathedral on 6 December to mark the Day of the Poor.
"We want to show that our place of worship is open to everyone and also offers space for those who are socially marginalised." Just as God stands by the side of all people, "we bring them into our midst and welcome their arrival".
In Berlin alone, it is estimated that several thousand people live on the streets.
During the cold season, they can receive support from the "Berliner Kältehilfe" organisation, which is supported by numerous church communities.