1) Make resistant to bad weather 2) Protected 3) Secure 4) Unaffected by the elements 1) Protected 
• (a.) Proof against rough weather.
Same as waterproof.
Weath'er·proof` adjective Proof against rough weather. 
[adj] - able to withstand exposure to weather without damage 2. [v] - make resistant to bad weather
adjective able to withstand exposure to weather without damage; `weatherproof electric wiring`; `a weatherproof coat`
An item of clothing or gear that is either waterproof, windproof, breathable, or a variation of the 3, but not always all 3.