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October 15, 2013

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As temperatures drop, autumn set to arrive

THE arrival of a strong cold front today is set to send temperatures tumbling and is likely to herald the start of autumn in Shanghai.

Temperatures are set to drop 8 degrees Celsius to just 20 degrees, say forecasters.

Monday was officially the 157th day of summer in Shanghai — the longest summer since records began in 1872.

But it could well have come to an end yesterday, when the mercury reached  28.1 degrees.

Due to the cold front, from today through the weekend, highs are not forecast to reach over 21 degrees.

The bureau declares the start of autumn when temperatures average less than 22 degrees for five consecutive days. The first of those five days is considered the first day of autumn.

So if low temperatures persist for five days, today would be the beginning of the meteorological autumn — 12 days later than usual.

The bureau noted other features of the record-breaking summer.

“This year’s arrival of summer on May 11 made it the second earliest on record,” said Zhang Ruiyi, a chief service officer of the Shanghai Meteorological Bureau.

Bureau data from 1971 to 2010 shows that summers grew longer, while winters shortened.

“But it’s not only the global warming that contributes to the longer summers,” Zhang said. “Other factors, such as this summer’s strong and stable subtropical high, can also be a cause.”

Drizzle is forecast across the city at dusk today, with gusty winds.

The mercury will drop to as low as 12 degrees in suburban areas on tomorrow morning, while downtown residents might feel a little bit warmer at 14 degrees. But the high is unlikely to exceed 18 degrees.

High pressure is expected to dominate the city at the weekend with cloudy skies and temperatures of around 21 degrees.



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