The Weeping, amongst unpredictable seasons on Roshar, is a consistent one. It marks the end of an old year, and the coming of a new one, with four weeks of constant rain. There are no highstorms during the Weeping. Gemstones cannot be infused during the Weeping, which can be problematic to the people of Roshar, and especially the Knights Radiant.
The Weeping is so consistent that it is used to determine people's ages. However, after the Parshendi release the Everstorm, the Weeping alternately stops and restarts repetitively. It acts strange, like regular weather, rather than the long, mild highstorm it is supposed to be.
It is common for people to go to bed earlier than they normally do during the Weeping because there aren't many spheres to light their way outdoors.
Lightday is the single clear day in the middle of the Weeping. Every other year a highstorm arrives on Lightday, but it is otherwise free of storms. The years without the highstorm are known as Light Years.