How to Say "december" in Spanish
The Spanish word for “december” is “diciembre” — A1 level. This is a very common word in everyday Spanish.
English → SpanishA1
nounA1
The twelfth month of the year

Examples
Mi cumpleaños es en diciembre.
My birthday is in December.
Diciembre es el último mes del año.
December is the last month of the year.
Hace mucho frío en diciembre en el norte.
It is very cold in December in the north.
Gender and Articles
Even though we usually don't need to say 'el' before 'diciembre,' it is a masculine word (el diciembre) just like all other months in Spanish.
Capitalization Error
Mistake: “Voy en Diciembre.”
Correction: Voy en diciembre. (Months are not capitalized in Spanish unless they start the sentence.)
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