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DP TE PARTICLESNOW
From Quake Wiki
Builtin definitions:
void(vector mincorner, vector maxcorner, vector vel, float howmany, float color) te_particlesnow = #410;
Temp entity definitions:
float TE_PARTICLERAIN = 56;
Protocol:
vector mins (minimum corner of the cube) vector maxs (maximum corner of the cube) vector velocity (velocity of particles) short count (number of particles) byte color (8bit palette color)
Creates a shower of snow, the snow will appear either at the top (if falling down) or bottom (if falling up) of the cube, low velocities are advisable for convincing snow.