What changed
Beijing is seeing light fog or mist on November 12, with clear skies, a high of 16°C and a low of 2°C. Over the following two days, temperatures will remain similar, but visibility and dispersion conditions are expected to worsen, with some areas potentially falling below 500 metres.
Why it matters
The main risk is not a dramatic temperature swing. It is the combination of light winds, a wide day-night gap and declining visibility. Road users may face harder conditions, especially where fog thickens, and authorities are advising caution during travel.
Warm layers will also matter: daytime highs near 15°C will give way to overnight lows of 3–4°C. The forecast does not specify which localities will fall below 500 metres or how long those conditions will last, so the practical impact will depend on where the fog settles.
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