根据新闻中the freezing temperatures are making the already dire situation of people fleeing their home even worse以及后来引用女士的话可知是糟糕的天气使难民逃离也门北部地区。

【听力原文】
Tens of thousands of people have fled the conflict in northern Yemen over the past five months, and they continue to leave in large numbers. The spokeswoman for the International Committee of the Red Cross, Dorothea Krimitsas, says the freezing temperatures are making the already dire situation of people fleeing their home even worse, "harsh weather conditions and winter conditions in northern Yemen are affecting the populations there, especially those fleeing who have absolutely no shelter and nothing and, sometimes no clothes. "