What's the best time of the year to go to Beijing?
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I believe the best time of year to be in Beijing is frm the middle of September to the middle/end of October, but this depends on the weather. You might not have consistently good weather (more than 1 or 2 days of it in a row) until the start of October. November can be nice, I believe, but it is starting to get cold then and is usually freezing outside by the time December rolls around. This lasts until March. In spring, there might be a week or two of nice weather but it doesn't last very long and the timing isn't very predictable.
At present, it is summer, most days are warm and hazy, visibility of on average 1 or 2 miles. Then along comes some rain/thunderstorms and for 48 hours, the skies clear up and you can see blue. The length of time the sky is "clear" is directly related to the length of time the wind blows from the west or north west.
Geographically, Beijing is at the foot of a bowl of mountains (to the west/north), so if the wind is from the south or east (which is most of the time, most of the year) then dirty air is being blown into a wall of mountains and when topped with inversion layers, has nowhere to go.