It is fairly windy in Dalian, due to the powerful Yellow Sea draughts that hit the jutting peninsular with refreshing fury.But the perennial current from the ocean helps moisten the air, making it fresher to breathe than some of China's other heavily industrial cities. As a world renowned summer resort, Dalian is at its most attractive between April and October.
Like most of northern China, the climate in Dalian is generally hot in the summer and very cold in winter. Summer temperatures average about 30°C (86 oF), but since Dalian is a port city, it is sometimes plagued by monsoon. In winter, the temperature can drop to as low as -17oC (1 oF).
Spring in Dalian starts from about middle March through the month of June. The city at this time enjoys comfortably mild and humid weather with clear days. Though sometimes a bit breezy and cool, it is advised that people in the area carry a wind-breaker, wear long sleeve shirts, and pants until the weather starts getting warmer in May and June.
Summer in Dalian is never scorching hot, although August is the hottest month with daily temperature generally over 24oC degree. The summer period from July to early September has an average temperature of around 20oC (68oF) and in August, the hottest month, thousands of people come to the city's southern seashore to enjoy the sunshine, sea, and exciting water sports. Travelers should bring T-shirts, shorts, skirts, sandals, sunglasses, a hat, and sun block. The summer is also the rainy period in Dalian, but most of the rain falls at night.
Autumn in Dalian is normally dry and temperatures range from 11o to 17o C. The autumn season arrives in late September as cold temperatures enter the region. The average temperature drops down to around 15 to 20oC (59 to 68oF). Therefore travelers should bring light jackets, some light pullovers, and slacks, especially if going out at night.
Winter in Dalian, generally speaking, it is not very cold in winter compared with other cities located in Dongbei (the northeastern part of China). From late November, the cold north winds become stronger and dominate the city till the following February. January is the coldest month, when it averages minus 4.9 oC degrees, with extremes as low as minus 24oC. January is the coldest month, so travelers will need to wear an overcoat, sweater, long johns, jeans, gloves, and warm socks and shoes.
Detailed information about the average temperatures and rainfall in Xi'an are as follows: