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Madrid has one of Europe's most extreme capital climates: temperatures range from -5°C in winter to 40°C+ in summer. The city sits on the Castilian plateau at 667 metres elevation, which creates large day-night temperature swings — including cold nights even in July and August when daytime highs are scorching.
That elevation is Madrid's ventilation advantage. Even in July, nights drop to 18–20°C, creating a 15–18°C swing between afternoon and pre-dawn. Nocturnal ventilation — opening windows from 11 PM through 7 AM — is one of the most effective passive cooling strategies available, capable of dropping indoor temperature to comfortable levels before the next afternoon peak.
Madrid's air quality has improved significantly since the Madrid Central low-emission zone launched in 2018. The city centre regularly sees AQI below 30. The main summer challenge is ground-level ozone, peaking on hot, still afternoons — exactly when temperatures already argue against opening windows.
À Madrid, les meilleurs moments pour aérer sont généralement tôt le matin (5–8h) et le soir tard, quand la température extérieure passe sous celle de l'intérieur.
Oui, dans la plupart des cas. Ouvrir les fenêtres peut faire baisser la température intérieure de 2–5°C en 30 minutes si l'air extérieur est plus frais.
Au-dessus de 80%, ouvrir les fenêtres rend l'air collant. Mieux vaut attendre des heures plus sèches.