Sun triumphed over cold weather (4)

I believe the answer is:

snow

I'm a little stuck... Click here to teach me more about this clue!

'cold weather' is the definition.
'snow' can be an answer for 'weather' (snow is a kind of weather). I'm not sure about the 'cold' bit.

'sun triumphed over' is the wordplay.
'sun' becomes 'S' (abbreviation).
'triumphed' becomes 'won' (I've seen this in another clue).
'over' shows that the letters should be reversed in order.
'won' in reverse letter order is 'now'.
's'+'now'='SNOW'

Can you help me to learn more?

(Other definitions for snow that I've seen before include "Standard of whiteness" , "Frozen precipitation" , "Crystalised rain" , "Settler" , "form of water" .)

I've seen this clue in The Independent.

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