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Lisboa has a subtropical Atlantic climate — warmer and sunnier than northern oceanic cities but tempered by consistent Atlantic airflows that moderate heat extremes. Summers are warm (25–30°C) and drier, winters mild (10–15°C) and wet. The combination of sunshine and Atlantic breeze makes for genuinely good ventilation conditions across most of the year. Spring and autumn — April through June and September through October — are the best seasons: outdoor temperatures of 16–22°C, moderate humidity, and clean air from Atlantic wind systems.
Summer management in Lisboa: on the hottest inland days, the morning ventilation window (6–9 AM) is effective, while late afternoons may be too warm for passive cooling unless a sea breeze is present. The Atlantic acts as a natural temperature regulator — coastal positions benefit from consistent onshore breezes that urban inland areas don't receive. Air quality in Atlantic-facing cities is among the cleanest in Europe, with persistent airflows flushing pollutants. Occasional peaks occur during extended calm anticyclonic periods in winter, when traffic emissions accumulate without dispersal. OpenWindow.live identifies these infrequent but genuine air quality events.
En Lisboa, los mejores momentos para ventilar son por la mañana temprano (5–8) y después del atardecer, cuando la temperatura exterior baja de la interior.
Sí, en la mayoría de los casos. Abrir las ventanas puede bajar la temperatura interior 2–5°C en 30 minutos si el aire exterior es más fresco.
Por encima del 80% de humedad, abrir ventanas hace el aire pegajoso. Mejor esperar a horas más secas.