1、1月的英语是：January。
2、例句：
（1）January is my least favourite month. 一月是我最不喜欢的月份。
（2）It was unseasonably mild for late January. 一月下旬天气就这么暖和有点反常。
（3）The new drug will be generally available from January. 这种新药从一月份开始将可大量上市。
（4）The weather, even for January, was exceptionally cold. 这种天气即使在一月份也算得上非常寒冷。