Rain particles appear on top of blocks at y=255 when weather is active, even in snowy biomes or biomes which don't have rain.
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Cannot reproduce in 1.8.1-pre4.

Can confirm in 1.8.1-pre4

Confirmed also in Mesa Plateau F. The block can only be placed there using /setblock.

It is possible due to the rain not able to access the biome in and below the block, because it is above world height.

Seems to be fixed in 1.10.2, possibly earlier.