In actuality months for Bunns follows the lunar calendar. They count months by numbers, so there’s no “January” as a word, they just call it the First Moon (similar to how Chinese is where they just wholesale number the months. So Jan is 一月 or First Moon).
Days and Nights
Day and night cycles are the same - although the last week of every month has a slightly longer night than the other days and is considered more sacred.
Why this happens? No one really knows but they’ve adjusted.
Two year seasonal cycle
The two year seasonal cycle follows this pattern:
All cities go through these seasons although Summer and Winter experiences much less change compared to Spring and Autumn.