January is the coldest month in a year.
January is the coldest month of the year.
January is the coldest month in a year.
Every once in a while a weather phenomenon that locals call the "Pineapple Express1" wafts into town, carrying breezes so balmy that you can walk the waterfront without a coat in the coldest months.
In the United States, January and February are the coldest months of the year, and July and August are the hottest.