I found seasons local_en, but I can't find months

Reason being that I like to shift them to match the weather - 12 months goes 3 months spring, 3 summer, 3 fall, 3 winter, so I like to shift the months to go March - May for spring, June - August for summer, September-November for fall, December-Febuary for winter, so I intuitively know how much longer the campaigning season will last