UV and at least some IR probably are refracted and reflected into rainbows similar to visible light.
Gamma rays simply go straight through lenses undeflected, so rain drops are probably treated much the same. I think Xrays are probably pretty similar, they are high energy, and don't respond well to normal lenses.
At the long wavelength end, I think it all falls down when the wavelength becomes about equivalent to the droplet size. The water droplet has to be bigger than the wavelength of the EM radiation for the radiation to see it.
Al.
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