Seasonal Highlights

1. Climate in China

During summer 2015, the mean precipitation was 297.6mm over China, which was 8.5% below normal (325.2mm). The seasonal surface air temperature averaged over China was 21.2°C, with 0.3°C above normal (20.9℃).  For the season, extremes of High Temperature (HT), Consecutive High Temperature (CHT), Daily Precipitation (DP) and Continuous Precipitation Days (CPD) were observed in China.

2. General Circulation Features

Northern Hemisphere: In the summer of 2015, in the field of mean 500hPa geopotential height anomaly, positive anomalies above 4 dam covered the regions from the central polar to locations of northeastern North America, central Europe, mid-southern Russia. Meanwhile, negative anomalies below -4 dam observed over the northeastern North Atlantic Ocean, parts of northwestern Russia.

Southern Hemisphere: During summer, in the field of mean 500hPa geopotential height anomaly, positive anomalies over 4 dam were observed over the southeastern South Indian Ocean, the southwestern South Pacific, the the mid-southern South Atlantic Ocean. Meanwhile, negative anomalies below -4 dam covered from the western Antarctica to southern South America.