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Sydney's temperate oceanic climate is among the most comfortable in the world for natural ventilation, but seasonal extremes have grown more pronounced. Summers average 26°C with 65% humidity — warm and pleasant, but occasional heatwaves (40°C+) and associated fire smoke make real-time air quality data essential. The ocean sea breeze known as the "Southerly Buster" arrives most summer afternoons, rapidly dropping temperatures by 8–12°C and clearing pollution.
Winters in Sydney are mild and dry — typically the best season for ventilation. July's average of 12–17°C means no heating concerns and generally clean air. The ventilation recommendation for winter Sydney is almost always positive.
The 2019–2020 Black Summer fires turned "should I open my windows?" into a genuine public health question, as smoke blanketed Sydney for weeks with AQI readings above 200. This experience made continuous air quality monitoring — exactly what OpenWindow.live provides — a practical necessity for Sydney residents throughout summer and autumn.
En Sydney, 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.