Rain Without Air Resistance: Dangerous? No.

No danger whatsoever. The premise is based on a misunderstanding of physics.

What Air Resistance Actually Does to Rain

• Raindrops reach terminal velocity (~9 m/s for large drops) due to drag
• Without air resistance, drops would accelerate at 9.8 m/s² continuously
• From cloud base (2 km): v = √(2gh) ≈ 200 m/s (Mach 0.6) – supersonic impact

But This Is Purely Hypothetical

• Air resistance always exists in Earth's atmosphere
• Raindrops cannot fall in vacuum – they'd boil off (zero pressure)
• The scenario is physically impossible

Real Rain Risks (With Air Resistance)

• Hypothermia (cold + wet)
• Flash floods
• Reduced visibility driving
• Lightning
• Contaminated runoff

Conclusion: Rain is safe. Air resistance makes it safer by limiting drop speed. The "no air resistance" scenario is a physics thought experiment—not a weather hazard.