Month | Abbreviation
------- | --------
January | janv.
February | févr.
March | mars
April | avr.
May | mai
June | juin
July | juil.
August | août
September | sept.
October | oct.
November | nov.
December | déc.
Note: You'll also often see months abbreviated with just the first three letters (e.g., Jan, Fév, Mar, etc.)