Welcomes atmosphere producing such precipitation (9)
I believe the answer is:
hailstone
'such precipitation' is the definition.
'hailstone' can be an answer for 'precipitation' (hailstone is a kind of precipitation). I'm unsure of the 'such' bit.
'welcomes atmosphere' is the wordplay.
'welcomes' becomes 'hails' (I've seen this in another clue).
'atmosphere' becomes 'tone' (tone is a kind of atmosphere).
'hails'+'tone'='HAILSTONE'
'producing' is the link.
Can you help me to learn more?
(Other definitions for hailstone that I've seen before include "Frozen pellet" , "Falling ice" , "It lands with a noise" , "sign of cold weather" , "a drop of the hard stuff?" .)