This is the 450th most frequent Russian word.
ноябре
"Ноябре" is the prepositional case of "ноябрь," meaning "November" in English.
Here, 'ноябре' serves to provide a temporal reference, indicating when the described event takes place.
В ноябре погода становится холоднее.
In November, the weather becomes colder.
The usage of 'ноябре' here is to locate the timeframe within which the general condition of the days is being described.
Дни в ноябре часто пасмурные.
The days in November are often cloudy.
The word 'ноябре' specifies the month specifically as November within the sentence, functioning as a time marker.