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Seoul has a continental monsoon climate with four sharply distinct seasons and a rainy summer period that defines the annual rhythm. Winters are cold and dry (typically −5 to 5°C), springs warm rapidly, and summers bring both high heat — often reaching 32–38°C — and the summer rain season that raises humidity significantly. Autumn is typically the most comfortable season for ventilation: clear skies, lower humidity, and falling but still-comfortable temperatures after the summer heat.
The summer ventilation window in Seoul is compressed by the combination of heat and humidity. Early morning is the most viable time: from 5–8 AM, overnight cooling brings temperatures down to 22–27°C with lower humidity than the afternoon peak. The monsoon rain periods temporarily reset conditions — the hours following summer rainfall often offer the day's best air quality and most comfortable temperatures. Winter brings the opposite challenge: cold dry air is easy to ventilate briefly, but heating emissions — coal, gas, or wood — can spike outdoor PM2.5 on calm, cold days. OpenWindow.live's real-time AQI monitoring is particularly valuable in Seoul during winter inversions, when air quality can deteriorate rapidly without obvious visible cues.
A Seoul, i momenti migliori per ventilare sono di solito al mattino presto (5–8) e dopo il tramonto, quando la temperatura esterna scende sotto quella interna.
Sì, nella maggior parte dei casi. Aprire le finestre può abbassare la temperatura interna di 2–5°C in 30 minuti se l'aria esterna è più fresca.
Sopra l'80% di umidità, aprire le finestre rende l'aria appiccicosa. Meglio aspettare ore più asciutte.