There are douze mois (12 months) in une année (a year) in French, just like in English. However just as with the days of the week, the months don’t start with a capital letter.
un mois - a month
une année - a year
When you look at the months of the year in French you can probably guess what they mean as many are very similar to English.
janvier - January
février - February
mars - March
avril - April
mai - May
juin - June
juillet - July
août - August
Did you notice some similarities? April – avril; May – mai; June – juin?
The last four months of the year all end –ber in English. Look at the French and see what you notice:
septembre - September
octobre - October
novembre - November
décembre - December
That's right! The –ber ending in English becomes –bre in French.
To say something happens in un mois (a month), you use the word en.
en - in
Mon anniversaire est en octobre. - My birthday is in October.
Je vais en vacances en juillet. - I go on holiday in July.