What are the climatic characteristics of Yan 'an?

Yan 'an City belongs to a warm temperate semi-humid arid climate zone, and the annual climate change is controlled by monsoon circulation.

March-May is spring, June-August is summer, September-165438+10 is autumn, and June-February-February is winter.

Spring is dry and rainy, the temperature rises rapidly, the climate is changeable, and there is strong wind and sand. Intraseasonal precipitation accounts for 65,438+07% of the annual total. The average temperature in March is 4.5℃, and the average temperature in May is 65438 06.9℃, and the highest temperature can reach 36.5℃. When strong cold air strikes, the minimum temperature can drop to about 0℃, resulting in frost.

It is hot and rainy in summer, and the seasonal precipitation is 3 12.3mm, accounting for 57% of the annual total. Most of the weather is intermittent and sometimes accompanied by hail. The seasonal average monthly temperature is 265,438+0.65,438+0-22.9℃, the hottest in July is 22.9℃, and the highest temperature in the season is 39.7℃, and there is no hot period.

In autumn, the temperature drops rapidly, and it is wet, rainy and foggy. The precipitation days in September are 1 1- 12, and the foggy days in September-10 account for half of the whole year. The first frost appears from late September to early October of 10, and the soil freezes in early October of 10.

In winter, there is little rain and snow. It is clear in Wan Li, dry and cold, and Dorsey is north. The precipitation in this season is only 13mm, accounting for 4% of the annual total. June is the coldest, with an average temperature of -6.4℃, an extreme minimum temperature of -25.4℃ and an average relative humidity of 54%-60%.

The annual sunshine in Yan 'an City is 24 18 hours, the sunshine percentage is 55%, the active accumulated temperature ≥0℃ is 3878. 1℃, and the annual average frost-free period 162 days, with more than one crop and less than two crops a year.

The precipitation in Yan 'an is mostly concentrated in summer, with heavy rainfall and high intensity, accounting for only 29% of the annual total from June 5438 to May of the following year.

Extended data:

Yan 'an natural resources

1, plant resources

There are 540 species of woody plants 19 orders, 83 families, 202 genera in Yan 'an, including 2 14 species of trees.

There are more than 370 kinds of natural grasses in Yan 'an.

There are more than 300 kinds of wild medicinal plants in Yan 'an.

2. Animal resources

There are 77 species of birds 14 orders, 28 families in Yan 'an.

There are 29 species of mammals in Yan 'an, belonging to 5 orders 1 1 family.

There are submicroscopic snakes, black-backed snakes, yellow-backed snakes, white-striped snakes, cauliflower welding head snakes, Zaocys, yellow-chained snakes, Agkistrodon, Maxi, Bufo bufo gargarizans, Gecko, Rana nigromaculata and Rana China.

There are butterflies, dragonflies, crickets, ladybugs, wheat moths, cabbage moths, moths, butterflies, locusts, slugs, bees, wasps and so on.