Crossword Genius

Going ahead without precipitate assessment? (4,4,2,5)

Ross

I believe the answer is:

come rain or shine

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

'going ahead without' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'precipitate assessment?' is the wordplay.
I cannot really understand how this works, but
'precipitate' could be 'rain' (raining is a kind of precipitating) and 'rain' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for come rain or shine that I've seen before include "Whatever the circumstances" , "Whatever the weather" , "regardless of circumstances" , "no matter what the circumstances may be" .)

I've seen this clue in The Independent.
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