Xi 'an and Dunhuang travel to understand their climate.
There is still a difference in the temperature difference between the two places. The temperature in Xi 'an is higher than that in Dunhuang, but it's all below zero. But don't worry, it will be sunny and warm after 11 o'clock (which is very different from that in the south). If you stay, there will be heating everywhere and you won't catch cold, so as long as you don't take a tent to go camping, there will be no problem.
Question 2
There will be different scenery in any season. There is no difference between the elephant and the atmosphere in Xi' an, but at least the transportation in the metropolis is convenient. It is usually snow (recommended Datang Furong Garden) and those famous tourist spots such as Terracotta Warriors and Horses, Huaqing Pool, Classic snacks such as the Great Wild Goose Pagoda in the Underground Palace of the Qin Dynasty, Chinese hamburger and mutton bread in soup should not be missed
Dunhuang winter is the Danxia landform in the ancient city of the Moon Spring Mogao Grottoes in Mingsha Mountain. These traditional tourist attractions are recommended to visit seven town, which is the living base in the rear of Qinghai Oilfield. Workers have worked hard all their lives to build it up, where they can eat delicious roast mutton in winter (the sheep here are basically Golmud sheep eating grass and drinking mineral water, and the meat quality is very good). There is a century-old shop in mutton city with yellow noodles of donkey meat. Unfortunately, you can't eat the delicious fruit which is a specialty here in summer. It's really delicious.
Question 3
Then I definitely recommend you to go to the summer vacation. Hehe, the best season just entering autumn has everything.
But there are many people.
You can leave me a message if you don't understand anything.