What climate does Hefei belong to?

The criteria for dividing the four seasons are: March-April in spring, June-August in summer, September-165438+1October in autumn, and June-February in winter.

The four seasons in Hefei are as follows:

From March 26th to May 20th in spring, the average temperature is 10 ~ 22℃.

In summer, from may 2 1 day to September 20, the average temperature is >: 22℃

In autumn, on September 21~165438+1October 15, the average temperature is 22 ~ 10℃.

In winter165438+1October1June to March 25th, the average temperature is < 10℃.

According to the climate, the four seasons are characterized by warm spring, summer inflammation, cool autumn and cold winter.

I. Spring in Hefei (March-April)

The general climate characteristics of Hefei in spring are: warm at first, cold, sunny and rainy. Due to the frequent cold and warm air activities in spring, the weather is often sunny and rainy, complicated and changeable.

The average temperature in spring is 65438 02.6℃. The average temperature in early March and early spring was only 7.7℃, while in late April and late spring it was as high as 18.4℃, which increased by 10.7℃. The historical extreme minimum temperature is -3.2℃, and the extreme maximum temperature is 32.7℃. It can be seen that the temperature in spring not only rises rapidly, but also changes greatly. In addition, the annual temperature rise varies greatly. The daily average temperature passed through March 3 1 the first day of daily average 12℃, the earliest was March 17 (2000), and the latest was April 14 (87 years), with a difference of 29 days. The average last frost date is March 23rd, the earliest is March 1 (1999), and the latest is April 14 (80), with a difference of 45 days.

The rainy weather is the most in spring, and the average number of days with daily precipitation ≥0. 1 mm is 22.8 days, accounting for about 20% of the total rainy days in the whole year. The average precipitation is 156.6 mm, accounting for15.7% of the total annual precipitation; The average total cloud cover is 6.8%, which is the highest in the whole year.

The average wind speed is the largest in spring, which is 3.2m/s, and the easterly wind is the most frequent wind direction. There is a local saying that "the east wind in spring is the ancestor of rain", because the east wind is increasing, which is caused by high pressure entering the sea, and the weather will turn bad at this time.

2. Summer in Hefei (June to August)

The main characteristics of summer in Hefei are: the longest season, hot weather, concentrated rainfall and high precipitation intensity.

The average temperature in summer is 26.9℃, which is 65438 04.3℃ higher than that in spring. From mid-July to early August, the average temperature in every ten days is above 28℃, and the highest temperature in the season is 365,438 0.0℃. The daily average extreme maximum temperature ≥35℃ is 12.6 days, with a minimum of 0 days (1987) and a maximum of 36 days (1978); The historical extreme maximum temperature is 41.0℃ (1August 23rd, 959).

The total precipitation in three months in summer is 436.6 mm, accounting for 43.9% of the total precipitation in the whole year. Rainfall is mainly concentrated in the rainy season, with an average plum blossom period of 17 in June, 10 in July and 24. 1 day. The plum blossom amount is 266.6 mm, accounting for 6 1. 1% of the total precipitation in summer. After the plum blossom, the temperature continued to be high and there was little rain in most years. Rainstorm weather is mainly concentrated in this season, accounting for 75% of the total in the whole year.

Thunderstorm weather is also concentrated in this season, and the average number of thunderstorm days over the years is 17. 1, accounting for about 66% of the annual total. Thunderstorms are often accompanied by strong winds.

Autumn in Hefei (September ~165438+1October)

The main characteristics of autumn climate in Hefei are: the shortest season, the rapid temperature drop and more sunny days.

The average temperature in autumn is 65438 03.7℃, which is 65438 03.2℃ lower than that in summer. After autumn, the warm and humid airflow in the south gradually weakened and retreated, and the cold air in the north continued to strengthen southward. The city is affected by the cold air in the north, and the temperature continues to drop. As the saying goes, "a gust of autumn wind sends cool." However, there are great differences between years. Although some years are autumn, there is still persistent high temperature weather, commonly known as "autumn tiger". Autumn is the most extreme.

The highest temperature is 38.6℃ (1September 7, 995); The maximum number of high temperature days is 7 days (1978).

In late autumn, cold waves often attack and the temperature drops suddenly. Seasonal extreme minimum temperature -5. 1℃( 165438+79 years1October 29th). The average first frost period is165438+1October 9, and the earliest is 65438+1October 22 (72 years).

The average precipitation in autumn is 196.7mm, accounting for about 19.8% of the annual total, and the number of precipitation days is 25. 1 day, accounting for about 22% of the annual total. The weather is dry in autumn. 1995 The total precipitation in autumn is only 57.2 mm, which is more than 70% less than the same period of normal years, and the autumn drought is serious. Maximum daily precipitation in autumn109.6 mm (71September 24th); The average number of rainstorm days is 0.3; The earliest frost date is 10 year122 October (72 years).

4. Winter in Hefei (12 ~ February)

The main features of the winter climate in Hefei are: colder weather, less rain and snow, and more sunny days.

The average temperature in winter is 4.0℃, the coldest is 65438+ 10, and the monthly average temperature is only 2.6℃. On average, every six days or so, there is a cold air going south and affecting the local area. If the lowest temperature is below 0℃ as the standard of cold weather, the city has an average of about 37.8 days per year; The average number of days when the extreme minimum temperature is below-10℃ is only 0.2 days. Extreme minimum temperature -20.6℃(65438+55 years1October 6); The extreme maximum temperature is only 25.2℃ (1Feb. 987 10).

The winter precipitation is the least, only 1 10.4 mm, accounting for about 1 1% of the total annual precipitation, with February 65438+ being the least. After the "beginning of spring" in February, with the enhancement of warm and humid air flow, precipitation began to increase, and the historical maximum daily precipitation was 39.7mm (65,434 in 84). There is snowfall every year in this city, and the average first snowfall date is 65438+February11; Average snowfall days 12.6 days, with a maximum of 22 days (1984); The maximum snowstorm amount is 39.7mm (1984 65438+ 10/8); The maximum snow depth is 45cm (65438 in 54 years+3 February1), and the snowstorm is severe.

The north wind increases in winter; The average foggy day is 7.6 days, accounting for 42% of the whole year, the most.