Rain itself doesn't "block" 2.4GHz signals per se, though any obstruction will cause some degree of radio wave attenuation. Attenuation is higher at 10GHz and a

Rain itself doesn't "block" 2.4GHz signals per se, though any obstruction will cause some degree of radio wave attenuation. Attenuation is higher at 10GHz and above, since the wavelength is shorter: higher frequency = shorter wavelength, and shorter wavelengths are obstructed by smaller objects. That being said, wet trees are more effective at attenuating non line of sight radio signals than dry ones, even at 2.4Ghz and below. So while the raindrops themselves have minimal effect for sub-10GHz signals, you can see signal fade in wet conditions.