Correct answer
When temperatures remain below about 7 °C.
A common guideline is temperatures remaining below about 7 °C. This is a usage recommendation, not a general Spanish obligation to change on a fixed date or at one isolated temperature reading. Performance depends on tyre and surface. Use vehicle-compatible tyres and adapt your driving; they do not guarantee unlimited grip on snow or ice.
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When temperatures remain below about 7 °C.
Only after snowfall, even if persistent cold has already arrived.
Always on 1 December, regardless of climate.
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