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40d:Weather
Weather changes with seasons, and brings wet, cold, hot, and dry conditions. It can be turned off by editing init.txt. This takes some load off of the CPU and can result in noticeably faster game play.
Rain
Rain is an event occurring at random intervals. The message "It has started raining" appears when it begins to rain. Rain has multiple effects: It cleans blood off of surfaces, fills murky pools, removes uncollected silk webs, and can give a dwarf an unhappy thought.
As stated above, when a rain hits a tile labled as a murky pool, it'll fill it up with 1/7 water. While not much, it can really help maps without 'unlimited' water supplies, such as rivers and brooks.
Rainfall occurs in temperate to scorching maps.
Snow
In winter, instead of raining it will snow. Snowing has very similar effects to rain, but instead of leaving "wet" squares, it will cover outdoor tiles with snow, including frozen pond tiles. "A snowstorm has arrived", is the message you receive when getting a snowstorm. In the event of a snowstorm, snow will slowly cover the surface the map with snow, and any dwarf caught in one may get an unhappy thought from it.
Snowstorms will occur in winter on temperate to freezing maps.