Icicle is formed when water dripping or falling from freezing object. Icicles can be generated during the bright, sunny but in a freezing weather, when snow and ice melt from sunlight or other heat source (for example, poorly insulated buildings), frozen as it drips with exposed conditions.

Over time, continued to runoff water will cause the icicle to grow. Another set of conditions during a snowstorm, when the rain in the air just below freezing slowly accumulate as many small icicles hanging from branches, leaves, wire, etc. Third, where the icicles can form once water seeps or is interrupted by vertical surfaces such as road cuts or cliff. Under certain conditions, they can slowly form a “frozen waterfall” favored by ice climbers.

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