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New York City's humid continental climate creates opposite challenges by season. Summers are hot and muggy — July averages 29°C with 65% humidity, and the urban heat island pushes some neighbourhoods 3–4°C above surrounding areas. The ideal ventilation window is early morning (5–7 AM) before heat builds, and potentially late evening if overnight temperatures drop below 22°C.
Winters are cold, dry, and windy — actually the best season for indoor air quality management. Cold dry outdoor air lowers indoor CO₂ and humidity effectively with brief ventilation bursts, and the dry air reduces mould risk considerably.
New York's growing exposure to Canadian wildfire smoke in summer is a serious air quality concern. AQI can jump from 30 to 150+ in hours during smoke events — exactly what OpenWindow.live's real-time AQI monitoring is designed to catch before you open a window. This has become a practical reality for New Yorkers in recent summers.
À New York, 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.