Seasonal Highlights

Climate in China

During the boreal summer (June-August), mean surface air temperatures were about 0.5℃ below normal in the joint regions among Henan, Shandong, Jiangsu and Anhui provinces, but near or above normal in other regions of China. Temperatures were at least 0.5℃ above normal in most Northwest China, central and northern Northeast China, Zhejiang and Shanghai, with over 2℃ above normal in parts of northern China.

For the season, the primary precipitation anomaly pattern was more precipitation in the south and less in the north. Precipitations were observed at least 30% more than average in parts of central Xinjiang, central Xizang, parts of central Inner Mongolia, the Jianghan area, the eastern Huanghuai area and most South China, with over 50% above normal in locations. Meanwhile, precipitations were observed 30-80% below normal in southwestern and northern Xinjiang, northwestern Xizang, western Gansu, and central Heilongjiang, with no precipitation in parts of Xinjiang. Precipitations were near normal in other regions of China.

Climate in the World

During the boreal summer, most of the world experienced a warmer season. Mean surface air temperatures were observed at least 0.5℃ above normal in southern Europe, West Asia, regions from eastern Central Asia to northwestern China, eastern Russia, northeastern North America, parts of western America, mid-eastern South America, North Africa and eastern Africa, with temperatures 2-3℃ above normal in locations. Meanwhile, temperatures were 0.5-1℃ below normal in North Europe, northwestern North America, the northern Indian Peninsula, and parts of Australia.

For the season, precipitations were observed at least 30% more than average in central Russia and parts of the Far East, Afghanistan, Indonesia, parts of North Africa, northwestern North America, parts of northeastern and southwestern North America, parts of northwestern South America and northeastern Australia, with over 100% above normal in locations. Meanwhile, precipitations were observed 30-80% below normal in mid-eastern West Asia, parts of Central Asia, central and western Mongolia, central Canada, northwestern America, central South America, southeastern Africa and parts of Australia, with no precipitation in locations.

General Circulation Features

Northern Hemisphere: During the season, in the 500hPa geopotential height anomaly field, positive anomalies above 4 dam covered regions from southeastern Russia to central North Pacific through the Okhotsk Sea, and regions from northeastern North America to the Greenland Island, with central values above 8 dam over the northeastern North America. Meanwhile, negative anomalies below -4 dam covered Alaska, Ireland and regions west to it. Heights were near normal in other regions.

Southern Hemisphere: For the season, zonal circulation prevailed at the mid-high latitudes. In the 500hPa geopotential height anomaly field, positive anomalies above 4 dam covered regions from central South Pacific to the polar region and most of the South Indian Ocean south to 30^oS. Heights were near normal in other regions.