from an AMA:

If the snapshot happens once per month it's weird that they don't specify monthly snapshots. in particular to that question

The way I understood it was the snapshot happens once only, i.e. on January 6th, and the token distribution "claim drop" based on the January 6th snapshot is spread out over 12 months. i.e. you claim a fraction per month to get the total over the course of a year.

definitely could be wrong. not 100% sure.