What is the lowest temperature in winter in Binxian County?

This county belongs to the warm temperate semi-arid continental monsoon climate. It has the characteristics of rain and heat in the same season, extremely cold and midsummer, and four distinct seasons.

Winter is mainly affected by Mongolian high pressure, with scarce precipitation and long cold and dry days. In spring, the Mongolian high pressure gradually decreased, the tropical heating mass gradually moved northward, the temperature rose rapidly and the precipitation increased. Due to frequent cold air activities and changeable weather, it is prone to "late spring cold", strong wind and frost. Summer is mainly affected by tropical high pressure, with hot climate, many thunderstorms, accompanied by strong winds or hail, and drought in late summer. In autumn, the Mongolian high gradually strengthened, and the subtropical high began to withdraw southward. When the cold air in the north goes south, it is blocked by the Qinling Mountains and moves slowly. So it is rainy in autumn, and the climate is cool and humid, but it is destroyed by frost.

Section 1 sunshine

The annual solar radiation in China is 1 15.2 kcal/cm2. The maximum in June is 14.2 kcal/cm2; The lowest in June+February of 5438 was 5.9 kcal/cm2. The annual total radiation in Yuan Shang is 1 17.6 kcal/cm2, and that in Chuan Dao is 1 12.0 kcal/cm2. The average daily radiation is above 400 calories /cm2 from April to August, and above 470 calories /cm2 from May to June. Sufficient solar radiation in spring and summer is very beneficial to high yield of grain and oil crops and fruit trees. The solar radiation in September-65438+1October is low, only 240-290 calories /cm2, which is not conducive to the maturity of autumn grain.

The annual average sunshine hours are 22 10.8 hours. June is the most, with an average of 237.3 hours; February is the least, with an average of 147.7 hours. Last year, the average sunshine hours were 2298.8 hours in tableland, 2 125.4 hours in Sichuan Road, and less than 200 1 hour in narrow areas such as Yu Tai.

The annual sunshine percentage in the territory is 52%, and the distribution trend is that the northern platform is higher than the southern platform. The sunshine rate is 56% in winter 65438+ 10, 47% in spring and autumn, and 5 1% in summer July.

Temperature in the second quarter

First, the temperature

The annual average temperature is 9.7℃, Kachuan Road11℃, plateau 9.3℃, annual extreme maximum temperature 40℃, extreme minimum temperature -22.5℃, and annual average temperature 3 1.5℃. The daily maximum temperature appears around 14, and the daily minimum temperature appears at 7-8 (6: 00 in summer).

65438+ 10 is the coldest month, and the average temperature in Yuan Shang is -3.3℃ and -4.5℃. Chuan Dao -2.9 degrees Celsius. It is the hottest in July, with an average temperature of 24.4℃, 265,438 0.5℃ in Yuan Shang and 25℃ in Chuan Dao. In winter, the temperature in the county is generally low, and the temperature in Yuan Shang is even lower. It is generally hot in summer, but the temperature difference between morning and evening is large. Winter (daily average temperature ≤ 10℃) is longer, Sichuan Road 160- 170 days, Zhaidian and Hanjiada 180- 190 days. Summer (average daily temperature ≥22℃) is short, 70 days in Sichuan, and only 10 days in Didian and Han Jia. Winter is long and summer is short, which is obvious all over the county, especially in Sichuan tableland. There is little difference between autumn and winter, about 3 months in spring and 2 months in autumn.

The active accumulated temperature ≥0℃ in China is 4273.4℃, the first day is February 22nd, and the whole day is165438+1October 28th, lasting for 255.9 days. The active accumulated temperature ≥3℃ is 4200. 1℃, the first day is March 9th, and the whole day is165438+1October 19, lasting for 232 days. The active accumulated temperature ≥ 10℃ is 3636.4℃. The first day is April 15, and the whole day is June 10 18, lasting 185.4 days.

The frost period in this county generally starts in the middle of 10, and in Yuan Shang, it starts in 10 and 13, starting on September 24th at the earliest, 1 10 at the latest and September at the earliest. The final frost period is generally around the end of April, April 24th, the earliest March 26th and the latest May 17 of the following year. Chuan Dao is April 2 1, the earliest is March 25, and the latest is May 23. The frost-free period is 175.6 days, Yuan Shang 172 days and Chuan Dao 177 days. In some years, due to the invasion of Siberian cold air, frost will suddenly appear in the strong cooling weather with a large range and a long time (2-3 days), which will seriously harm crops.

Second, the ground temperature.

The average annual ground temperature in this county is 13. 1℃. 5438+ 10 The average ground temperature in June is -20℃, and that in July is 6℃. The extreme maximum ground temperature is 68.5℃ (1August 975 18) and the extreme minimum ground temperature is-27.6℃ (1June 977 13). The annual variation trend of ground temperature is basically consistent with air temperature, with the lowest in 1 month and the highest in July and August.

The average ground temperature at different depths is 12.8℃, 10cm is 12.9℃, and 40 ~ 160cm is 13.0 ~ 13.2℃. The average frozen soil depth is 59 cm, including 68 cm in Yuan Shang and 50 cm in Chuan Dao. The frozen soil depth is the largest in 1 and February.