The most common and most likely answer to this crossword clue is the 4 letter word HAIL
H
A
I
L
More clues leading to the result HAIL
Buddy explains!

The straight part
We know that "Welcome/wintry weather" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case welcome/wintry weather = hail.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does HAIL mean?
HAIL noun- Balls or pieces of ice falling as precipitation, often in connection with a thunderstorm.
- Of hail, to fall from the sky.
- To send or release hail.
- To pour down in rapid succession.
- To greet; give salutation to; salute.
- To name; to designate; to call.
- To call out loudly in order to gain the attention of
- To signal in order to initiate communication with.
- Healthy, whole, safe.