Climate of China in 2017

23-01-2018Source:China Meteorological News Press

On January 15, 2018, China Meteorological Administration (CMA) released China Climate Bulletin in 2017. According to the Bulletin, China was subject to a relatively higher temperature and more rainfalls in 2017. Drought, typhoon and severe convective weather conditions were less damaging, while losses triggered by rainstorms were more disruptive.

Average temperature took the third spot and the number of high temperature days topped the list in record.

In 2017, national average temperature registered 10.39℃, up by 0.84℃, occupying the 3rd place since 1951, second only to that in 2007 and 2015.

The average number of high temperature days (daily temperature peak ≥35℃) was 12.1 days, 4.4 days more than normal years, the first place since 1961.


Rainfalls were more profuse and the days of rainstorm approximates that of normal years

In 2017, national average precipitation recorded 641.3 mm, 1.8% higher than normal years.

The length of autumn rain in West China was about the same in normal years, with 49% more rainfall, reaching the peak since 1984.

Most portions of China were exposed to fewer hours of sunlight

In 2017, exposure to sunlight in most portions of Northwest China and Northeast China, North China, eastern Huanghuai Region, western Southwest China and Inner Mongolia exceeded 2000 hours. Across the large expanse of China, this figure was diminished by 100 to 400 hours.


Dominant meteorological disasters and extreme weather and climate events

In 2017, disasters like drought, typhoon and severe convective weather events wrecked less havoc, while losses incurred by rainstorms were more impairing. According to initial statistics, the area plagued by drought, rainstorm and flooding, typhoon, hailstorm, and low temperature, frostbite and snow disaster accounted for 50%, 32%, 2%, 14% and 2% of total disaster-inflicted regions respectively.

Rainstorm processes with higher frequency, overlapping, and extreme features

Amid the flood season in 2017, the entire nation was in the grip of 36 rainstorm processes, with highly overlapping rainfall area and strong extreme features. Rainstorm, flooding, and geological disasters have given rise to grave direct economic losses. Daily rainfall extremes registered in 31 observing stations have breached historic records. Many of those befell regions with a low incidence of rainstorm.


Typhoon made landfall with intensive intervals and overlapped sites

In 2017, 27 typhoon have generated over Northwest Pacific and South China Sea, up by 1.5 compared with normal years. 8 typhoons made landfall in China, more than that in normal years. Direct economic losses imposed by typhoons evidently abated. However, Typhoon Hato was characterized by strong intensity and calamitous impacts.

Track map of typhoons making landfall in China

Numerous days of high temperature, early onset of high temperature in northern China and strong intensity in southern China

Average number of high temperature days across the nation registered 10.7 days, up by 3.8 compared with normal years, ranking the first during the same period since 1961. Northeast China and North China has been plagued by the earliest high temperature process since 1961. Southern portions of China have experienced protracted large-scale high temperature weather. 40.9℃, a new record has been set in Xujiahui, Shanghai, a record-shattering one since 1873.

What’s more, China was vulnerable to other meteorological disasters in 2017: despite relatively mild impacts, regional and staged droughts were pronounced; numerous severe convective weather events have cropped up with fewer losses; extended span of hazy weather from the outset of 2017, exerting a colossal impact on air quality and human health.(Jan. 23)

Reference: China Climate Bulletin 2017

Editor: Liu Shuqiao

Art Editor: Guo Manru