The Narnian calendar system was never elaborated on by C. S. Lewis. We do know there’s a Christmas, a Midwinter snowball dance, and Summer Bacchanals, which, though are not mentioned as taking place on the summer solstice, are similar enough to Beltane that they likely might. There’s also the name of one month — Greenroof — mentioned.
Since I always wondered what other months there were, here’s my headcanon of them. There are only six for simplicity.
Snowgay
Rainbloom Greenroof Sunmorn Leafdrop Shiverwood |
January, February
March, April May, June July, August September, October November, December |