Why are rain dances not considered effective methods of increasing precipitation?

Rain dances are not considered effective methods of increasing precipitation because they lack any scientific basis for altering atmospheric conditions.1

In meteorology, precipitation is a complex process involving the cooling of rising air to its dew point, which allows water vapour to condense onto condensation nuclei to form clouds. For rain to fall, droplets must grow large enough to overcome the lifting effect of air currents.2

Scientific weather modification, such as cloud seeding, relies on introducing specific substances like silver iodide or dry ice into existing cloud systems to encourage the formation of ice crystals or the coalescence of droplets. Unlike these targeted interventions, which require the presence of specific meteorological conditions and existing cloud cover, primitive methods like rain dances have no mechanism to influence the physical state of the atmosphere or the development of clouds.13