The geographical distribution of temperature in this area is mainly controlled by topography. The annual average temperature is 65438 04℃. The west is slightly lower than the east, and the north and south mountainous areas are lower than the flat dams and hills. The annual average temperature in Pingba area below 600 meters above sea level is14.2 ~14.6℃; Generally speaking, the annual average temperature in areas above1000m is lower than 12℃.
Hanzhong is located in the mid-latitude of the northern hemisphere, forming a warm and humid airflow with annual precipitation, mainly from the Bay of Bengal in the Indian Ocean, followed by the Western Pacific Ocean. In summer, under the influence of the subtropical high, the water vapor in the Bay of Bengal flows northward along the southwest monsoon in the lower part of the southwest vortex, passing through Tibet, Yunnan and northwest Sichuan, reaching over this area. The water vapor in the western Pacific enters this area with the southeast airflow at the edge of subtropical high.
The annual average relative humidity distribution in the whole Hanzhong area is basically small in the south and small in the north. 70-80% of Hanjiang and Bashan Pingba; Qinling 73%. It is smaller in winter and spring and larger in summer and autumn. The month of 9. 10 is the highest in the whole year, with 80% ~ 86%. In winter (12, 1, February), 75%~80% is in Pingba and Bashan areas of Hanjiang River.
Extended data:
The geographical environment of Hanzhong:
1, location
Hanzhong city is located in the geographical and geometric center of Chinese territory, southwest of Shaanxi Province. It belongs to the northwest in administrative division, and the geographical and natural environment belongs to the southwest. Hanzhong City borders Qinling Mountains in the north, Baoji City and Xi City in Shaanxi Province, Daba Mountain in the south, Guangyuan City and Bazhong City in Sichuan Province, Ankang City in Shaanxi Province in the east and Longnan City in Gansu Province in the west.
2. Terrain
The Qinling Mountains in the north of Hanzhong City are like a barrier, with the highest peak at Ding Liang, Hunrenping, Yangxian County, with an altitude of 307 1 m. Other higher peaks are Guangtou Mountain in Foping County, Motianling Mountain in Yangxian County, 2838 meters, Baizi Mountain in Liuba County, 2665,438+00 meters, and Guangtou Mountain in Mianxian County, 2606 meters. General mountain elevation 1000 ~ 20000.
3. Hydrology
The rivers in Hanzhong City belong to the Yangtze River Basin. Judging from the composition of water system, it is mainly the east-west Hanjiang River system and the north-south Jialing River system. Hanjiang River, also known as Hanshui River and Mianshui River in ancient times, is the largest tributary of the Yangtze River. Hanzhong city is located in the upper reaches of Hanjiang River. The main stream of Hanjiang River flows through Ningqiang, Mianxian, Nanzheng, Hantai, Chenggu, Yangxian, Xixiang and other counties (districts) from west to east, and crosses Hanzhong Basin, which is the skeleton of Hanzhong water network.
Baidu encyclopedia-Hanzhong