stk-code/data/gfx/snow.xml

<?xml version="1.0"?>

<!-- For sky particles, the size of the box is ignored -->
<particles emitter="box" randomize-initial-y="true">

    <spreading angle="3"           />
    
    <velocity  x="-0.005"
               y="-0.01"
               z="-0.005"             />
    
    <material  file="snowflake.png" clampu="Y" clampv="Y" />
    
    <!-- Amount of particles emitted per second -->
    <rate      min="1000"
               max="1000"           />
    
    <!-- Minimal and maximal lifetime of a particle, in milliseconds. -->
    <lifetime  min="8500"
               max="9500"          />
    
    <!-- Size of the particles -->
    <size      min="0.10"
               max="0.30"          />
    
    <color     min="255 255 255"
               max="255 255 255"   />

    <wind      flips="Y"           />

</particles>