Whence the rain can be cold around mid-January (5)
I believe the answer is:
cloud
'whence the rain' is the definition.
I can't judge whether this defines the answer.
'can be cold around mid-january' is the wordplay.
'can be' is an anagram indicator.
'around' indicates putting letters inside.
'mid' indicates the central letters.
The middle of 'january' is 'u'.
'cold' with letters rearranged gives 'clod'.
'clod' placed around 'u' is 'CLOUD'.
Can you help me to learn more?
(Other definitions for cloud that I've seen before include "Condensed air vapour" , "Mass of vapour visible in the air" , "Become less transparent" , "It hides the sun" , "Visible vapour in sky" .)