This patch set has been migrated into a branch in the Crossfire RPG Game repository, where it will hopefully have more eyes on it and progress faster than the speed of me.
See https://sourceforge.net/p/crossfire/crossfire-server/ci/weather/tree/ for the current server code, https://sourceforge.net/p/crossfire/crossfire-maps/ci/weather/tree/ for the map changes, and https://sourceforge.net/p/crossfire/crossfire-arch/ci/weather/tree/ for the archetype changes.