Rain is darker than white noise and keeps changing, while white noise is bright and perfectly steady. Neither has been shown to work better for sleep: choose rain if you like something to listen to, white noise if you want nothing to follow.
The measured difference
Between 2 and 12 kHz, Soft rain falls 4.4 dB per octave and White static rises 1.6 dB per octave. At 12 kHz the rain is 9.9 dB further down, relative to each sound's overall level. That missing top end is why rain sounds soft and white noise sounds sharp.
Band by band, in numbers
| Band | Soft rain | White static | Difference |
|---|---|---|---|
| 2 kHz | −3.5 dB | −7.8 dB | −4.3 dB |
| 2.5 kHz | −4.2 dB | −7.2 dB | −3.0 dB |
| 3 kHz | −4.8 dB | −6.6 dB | −1.8 dB |
| 4 kHz | −6.0 dB | −5.7 dB | +0.3 dB |
| 5 kHz | −7.3 dB | −4.8 dB | +2.5 dB |
| 6 kHz | −8.7 dB | −4.2 dB | +4.5 dB |
| 8 kHz | −11.3 dB | −3.5 dB | +7.8 dB |
| 10 kHz | −13.2 dB | −3.8 dB | +9.4 dB |
| 12 kHz | −14.5 dB | −4.6 dB | +9.9 dB |
Steady or moving
Every second of white noise sounds like the last. Rain has drops, gusts and changes in strength, which gives you something to listen to and also something that can catch your attention.
Something in between
If white noise is too sharp and rain too busy, pink noise has rain's softer balance with noise's steadiness.



