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Nantong, a port city in southern Jiangsu province, sits on the north bank of the Yangtze near its mouth, close to where the great river meets the East China Sea, at approximately 31.98°N, 120.89°E. It has a humid subtropical climate (Köppen Cfa) under the East Asian monsoon — with hot, humid summers and cool, damp winters — moderated a little by its coastal, riverside position, with four distinct seasons and a plum-rain season.
Summer, from June to August, is hot and humid, with July and August the warmest months — average highs around 31–32°C — slightly tempered by proximity to the sea and the broad Yangtze, though still muggy. Early summer brings the plum rains in June, and late summer and early autumn bring the risk of typhoons off the East China Sea, with heavy rain, strong winds and storm surge along the exposed coast.
Winter, from December to February, is cool to cold and damp, with January the coolest month — average highs around 8°C and lows near 0°C, dipping to frost on the coldest nights with occasional light snow. Coastal winds off the East China Sea can sharpen the raw, damp cold, though the sea keeps the deepest freezes at bay.
Nantong receives around 1,000–1,100 mm of rain a year, concentrated in the summer with the plum-rain season and typhoon-driven downpours contributing the heaviest falls, while winter is the drier season though damp. Live rainfall, humidity, and pressure readings for the city are shown in the panels above.
Nantong's position at the mouth of the Yangtze, where the great river meets the East China Sea, gives it a slightly maritime edge to the delta climate and leaves it directly exposed to the typhoons that sweep the coast in late summer and early autumn, bringing torrential rain, damaging winds and storm surge. Otherwise it shares the delta's hot muggy summers with plum rains and cool damp winters.
To follow any single measurement in Nantong more closely, use our live instruments: the online barometer for atmospheric pressure, the thermometer for temperature, the hygrometer for humidity, the anemometer for wind speed, the wind vane for wind direction, and the rain gauge for rainfall.