joulukuussa
Joulukuussa is a Finnish adverbial form meaning “in December” or “during December.” It is derived from joulukuu, the month of December, and represents the inessive case of that noun. In Finnish, month names take endings to indicate time frames, and joulukuussa specifies events, weather, or other conditions occurring within December.
Usage and examples: The word is common in both spoken and written Finnish. Examples include sentences like