How Rainfall Occurs ?🌧 What's the cause of Rain ??? Click and See here !!!
Within a cloud, water droplets condense onto one another, causing the
droplets to grow. When these water droplets get too heavy to stay suspended
in the cloud, they fall to Earth as 
>rain
Rain is liquid water in the form of droplets that have condensed from atmospheric water vapor and then become heavy enough to fall under gravity. Rain is a major component of the water cycle and is responsible for depositing most of the fresh water on the Earth. It provides suitable conditions for many types
of ecosystems, as well as water for hydroelectric power plants and crop irrigation.
The major cause of rain production is moisture moving along
three-dimensional zones of temperature and moisture contrasts known as
weather fronts.
If enough moisture and upward motion is present,
precipitation falls from convective clouds (those with strong upward
vertical motion) such as cumulonimbus (thunder clouds) which can organize
into narrow rainbands.
In mountainous areas, heavy precipitation is possible
where upslope flow is maximized within windward sides of the terrain at
elevation which forces moist air to condense and fall out as rainfall along
the sides of mountains. On the leeward side of mountains, desert climates
can exist due to the dry air caused by downslope flow which causes heating
and drying of the air mass. The movement of the monsoon trough, or
intertropical convergence zone, brings rainy seasons to savannah
climes.
The urban heat island effect leads to increased rainfall, both in amounts
and intensity, downwind of cities. Global warming is also causing changes in
the precipitation pattern globally, including wetter conditions across
eastern North America and drier conditions in the tropics. Antarctica is the
driest continent.
The globally averaged annual precipitation over land is
715 mm (28.1 in), but over the whole Earth it is much higher at 990 mm (39
in).[1] Climate classification systems such as the Köppen classification
system use average annual rainfall to help differentiate between differing
climate regimes. Rainfall is measured using rain gauges. Rainfall amounts
can be estimated by weather radar.
Rain is also known or suspected on other planets, where it may be composed
of methane, neon, sulfuric acid, or even iron rather than water.
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