Reuters photographer Marko Djurica: "Since the beginning of the migrant crisis, my colleagues and I asked ourselves the same question: what will happen when the winter comes? We were thinking of a Balkans winter: minus 20 degrees Celsius and wind so strong that you have to walk backwards into it. Most migrants come from Syria and Iraq and they have only seen snow in the movies. I remember a young girl saying, while holding a snowball, that she didn't know snow was cold. After weeks and weeks of weather more like springtime than winter, a forecast on my phone got me packing my gear. I headed to the Serbia-Macedonia border, as down there migrants have to walk 10km in rough terrain before they can board a train to Serbia. Snow was falling and I saw a first group crossing the border. The wind was so noisy that they weren't able to talk to each other. Another group arrived with lots of kids. Many of them were crying from the cold. I was speechless. A man approached me. 'Mister how much further do we have to walk?' About 5km, I said. He turned and pointed to a group some 50 metres behind. 'One, two, three, four, five. That's my family. The one on the left who is walking in pain is my sister. She broke her leg in Aleppo last year, I am afraid for her.' I tried to calm him down, explaining that there were people here to help. I explained that they had to catch a train in Presovo and travel to Croatia, then on to Slovenia, and Austria before reaching Germany. 'Six of us have 60 euros left. Do you think it will be enough for us to finish our journey?' I was speechless again."