Question

How would a weather reporter say 0.103 meters of snow

Answer 1

They would say that there is
zero point one-zero-three meters of snow, 
zero point one oh three meters of snow
point one hundred three meters of snow, etc.
I'm not exactly sure what you are looking for, so hopefully one of these works :)

(I personally haven't ever heard a weather reporter say this, as I live in a place without snow. pick the one you think is closest to something they'd say XD)