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Rome has a Mediterranean climate with hot, dry summers and mild, rainy winters. July and August are the challenging months for ventilation, with temperatures regularly reaching 33–37°C and humidity in the Tiber valley creating a sticky urban microclimate. The city's dense stone construction absorbs heat during the day and releases it slowly overnight.
In a Roman summer, the ventilation window is extremely narrow — only from about 5:30 to 8:00 AM, when outdoor air is cooler than indoor. Romans have long practiced oscurare: keeping shutters closed all day, which reduces indoor temperature by 3–5°C without air conditioning. This is not just tradition but effective passive cooling that genuinely works.
Air quality in Rome is moderate (AQI 35–65), with elevated NO₂ near the GRA ring road. Pollen is significant from January (olive) through May (grasses) — relevant for allergy sufferers considering overnight ventilation in spring and early summer.
À Roma, 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.