Rain is a temporary, global occurrence that can happen randomly at any time but not in Taiga, Tundra, Savannah, or Desert biomes (in Taiga and Tundra, it snows instead). If you are near to both a biome that produces rain and another that produces snow, you can see both snow and rain.
 Rain and snow
- Thunderstorms may occur.
- The light from the sun decreases by 3, to light level 12 in full daylight. Moonlight is not reduced, and remains at light level 4.
- The Sun, Moon and stars are no longer visible (even in the desert).
- The sky during the day is a grayish blue hue and clouds are gray instead of white.
- It does not solidify lava or put out torches, but it does put out fires, except those on netherrack.
- Mobs on fire will be put out on contact with rain; this prevents skeletons and zombies from burning in daylight.
- Flaming arrows will be put out on contact with rain.
- Fish are more abundant during rain.
- Wolves will shake themselves dry (certain versions only).
- Farmland is hydrated if it isn't already.
- Endermen may die due to their weakness to water. They will also teleport around until they find a place which is dry.
- Blazes that entered the Overworld, either via a spawn egg or a Nether Portal will also be harmed by rain.
- Rain will fill up a cauldron with water. It is extremely rare.
- Rain may cause frame drops or as some people call it "lag" making it harder to play.
|Rain was introduced purely for cosmetic purposes in Classic. The mechanics were simple, only testing if there is a block above to shelter the rain. It could be toggled on and off in-game using the F5 key.|
|The feature mentioned above was removed.|
|1.5||Rain and falling snow were implemented after a teaser video was released. Rain looks identical to the rain in Classic, but also plays two different sound files.|
|1.5_01||Fixed a bug where rain fell through certain blocks like glass, stairs and slabs.|
|1.6||Fixed a bug where the rain seemed to freeze when climbing down ladders until you reached the bottom or changed direction, possibly indicating that you climbed at same speed as the rain fell.|
|Fixed a bug where rain and snow fell underwater.|
|TU5||Improved the rain edges (when looking up in rain).|
Issues relating to "Rain" are maintained on the issue tracker. Report issues there.
- Rain falls at approximately the same speed one can descend while flying. This means that it is actually possible to free fall faster than the rain particles.
- If you fly up when it rains, the rain appears to fall faster. if you fly down while it rains, it will make the raindrops appear to be frozen in time.
- From Minecraft 1.0.0 onwards, if you turn particles to minimal, the rain is silent.
- Rain falls only in the two middle lines of a block, therefore it looks like it is not raining directly above you, but actually the "square" in the sky is shifted half a block in each direction.
- Although you cannot see the sun during rain, the glow associated with sunrise and sunset is still visible.
- When the player uses a Bed, the rain stops when they wake up.
- Rain still falls above the clouds. Notch's explanation is that the gray above the clouds during a storm is another layer of clouds and the origin of the rain.
- Rain particles are only visible in nearby chunks, but its effects occur over all loaded areas.
- Rain actually falls one block into the void (Layer -1). This can be seen in Creative Mode by floating in the Void. Note that no particles are emitted from the rain, due to the absence of a block below it.
- Rain makes noise when it hits a block, and the noise can be heard at any point within 16 blocks. This means that if the player is flying in creative mode at least sixteen blocks above the nearest block rain is hitting, the player cannot hear the rain.
- The average rainfall lasts .5-1 days, and there is a .5 to 7.5 day delay between rainstorms.
- When at excessively high y coordinate values, rain becomes more strip-like the higher you get. Rain is invisible at the top and sides at y coordinate 2147483636 feet pos.
- The player can sleep in a bed during a thunderstorm, even if it is daytime.
- All rain turns into snow at y:461