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Vienna sits at the crossroads of Alpine and Pannonian climate influences. The Danube Valley channels cold Alpine air in winter and warm air from the Hungarian Plain in summer, giving Vienna more temperature extremes than Western European capitals. Summer highs reach 28–30°C; winters regularly drop below freezing.
The Föhn — a warm, dry wind from the south — is Vienna's most distinctive ventilation event. It can raise temperatures by 10–15°C in hours, sometimes creating unseasonable warmth even in winter. Föhn days bring excellent air quality and dramatic Alpine views visible from the city. Austrian ventilation culture mirrors Germany's: Stoßlüften (burst ventilation) is the norm over tilted windows left open all day.
Vienna's outdoor air quality is among the best of any European capital (AQI 15–30). Pollen is significant from March through July, with birch, grasses, and late-summer ragweed being the primary concern for allergy sufferers deciding whether to ventilate overnight.
Em Wien, 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.