How were Zeus and Indra connected to storms, rain, fertility, and warfare?

In the context of nature worship, both Zeus and Indra are prominent atmospheric deities whose roles as sky gods link them to storms, rain, and warfare.12

Atmospheric Power and Warfare

As sky gods, both deities are associated with the violent and powerful forces of the atmosphere. Zeus is recognized as the sender of thunder, lightning, and winds, wielding the thunderbolt as his traditional weapon. Similarly, Indra is the lord of the winds and gales, using lightning and the thunderbolt to defeat cosmic enemies, most notably the dragon Vritra, who hoards the waters. Because these gods represent "useful force" in nature, their ability to command the elements makes their connection to warfare a natural extension of their power; Indra is often cited as the quintessential Indo-European warrior god, while Zeus serves as the ruler and protector of gods and humans.2341

Rain and Fertility

The association with rain is central to their roles as providers of fertility. By releasing life-giving waters, these gods ensure the growth of crops and the stability of the world. In Vedic religion, Indra is invoked to break the monsoon, an event vital to agriculture, and is celebrated by agriculturalists for bringing welfare and happiness. Likewise, Zeus is regarded as the sender of rain, a function that underscores his role in maintaining the natural order and supporting the life of the community.42