The simple answer is: it depends entirely on the furniture's materials, construction, and finish. Not all pieces are created equal for permanent outdoor exposure.
High-quality urban outdoor furniture designed for all-weather use is typically built from materials like:
* Powder-Coated Aluminum: Highly rust-resistant and durable.
* Marine-Grade Polymer/Rattan: UV-stabilized and moisture-resistant.
* Teak and Acacia Hardwoods: Naturally oily, offering good rot resistance.
* Stainless Steel (Grade 304 or 316): Excellent corrosion resistance.
For year-round survival, especially in rain and snow, construction is key. Look for water drainage holes, tight weave synthetics that won't hold moisture, and rust-proof hardware.
Even durable furniture benefits from protective measures. Using fitted covers during harsh winter months, applying teak oil annually, and storing cushions indoors dramatically extend lifespan. Cheaper, powder-coated steel or non-treated woods will likely rust, crack, or degrade if left uncovered in wet, freezing conditions.
In conclusion, you *can* leave furniture outside year-round only if it is specifically designed as all-weather, and you provide basic maintenance. Always check the manufacturer's warranty and care instructions for the definitive guide to your specific set's capabilities.