Beijing lies in the continental monsoon region in the warm temperature zone and its climate represents as hot and rainy in summer and cold and dry in winter.
The four seasons in Beijing are distinct. It is dry, windy and sandy in spring and hot and rainy in summer. Autumn is the best season in a year when the sky is blue; the air is crisp, mild and humid. However, winter is cold and dry with little snow. The average temperature throughout a year is 11.7. The average temperatures of the hottest month, July and the coldest month January range from 27 and -4.6. The shorter seasons, spring (usually from February to April) and autumn (usually from August to October) are better seasons for visiting Beijing when it is sunny and warm with few tourists crowding in the attractions.
If you come to Beijing in spring, you could wear a thin sweater, a pair of sweat pants, and a coat. But sometimes it may be a good idea to bring a warm cap because it is windy and sandy during this period though it is not cold. In summer the temperature could reach as high as 30. When you go out, you could take an umbrella along with you if it doesn't bother you much, because a downpour may come unexpectedly at evenings from July to August. Autumn is the most beautiful season, but after October you may feel the constant changes of the weather and you may encounter light rains at any moment. So it is better to bring some heavy clothes with you. In winter, you need a heavy woolen sweater, and a long wind coat or a down jacket. Generally there will be two or three heavy snowfalls each winter, so it is always wise for you to have anti-skidding shoes with you when you come. Lastly, don't wear light-color clothes in winter.