Decisão ao vivo para Portland. Atualizada a cada 30 minutos.
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Portland has an oceanic climate — mild temperatures year-round with persistent maritime moisture and more rain than continental cities. The advantage is stability: outdoor temperatures rarely create the extremes that make ventilation dangerous. The main challenge is humidity: on many days, outdoor relative humidity reaches 75–90%, and opening windows in warm, humid weather can increase indoor moisture rather than improving comfort. The key judgment is distinguishing temperature from comfort — 18°C at 85% humidity feels refreshing briefly but raises indoor dew point, risking condensation over time.
Summer evenings and nights are typically the best ventilation window in Portland: temperatures drop to 13–18°C, Atlantic or coastal breezes lower humidity, and outdoor air is consistently cleaner than during daytime traffic hours. Winter ventilation requires burst opening rather than continuous exposure: the combination of cold (1–7°C) and high humidity means extended open windows bring damp cold air that costs significant energy to reheat. OpenWindow.live accounts for both temperature and humidity in its decision, flagging high-humidity conditions where ventilation should be limited or done briefly.
Em Portland, 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.