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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.
Em Madrid, os melhores momentos para ventilar são geralmente de manhã cedo (5–8h) e ao final da noite, quando a temperatura exterior desce abaixo da interior.
Sim, na maioria dos casos. Abrir as janelas pode baixar a temperatura interior em 2–5°C em 30 minutos se o ar exterior estiver mais fresco.
Acima de 80%, abrir as janelas torna o ar pegajoso. Melhor esperar por horas mais secas.