The best year-round integrity is autumn (September-165438+1October).

The absolute maximum temperature is 43℃

Absolute minimum temperature-14℃

The annual average temperature is 15.7℃

The average temperature in the hottest month is 28.65438 0℃

The average temperature in Leng Yue is-2.65438 0℃.

The annual average rainfall is1021.3mm.

The maximum average humidity is 8 1%

The maximum wind speed is19.8m/s.

Maximum freezing depth of soil-0.09m.

The dominant wind direction in summer is southeast wind and east wind.

The dominant wind direction in winter is northeast wind and east wind.

The earthquake intensity is 7 degrees.

In the frost-free period of 237 days in 2000, the climatic characteristics of Nanjing are: the annual precipitation is unevenly distributed, with drought first and then waterlogging. Although there are obvious rainy and snowy weather in "April 9" and "May 9" in winter, the total amount of seasons is still less. It seldom rains in spring and summer. The plum season in a year: arrive late and leave early, with short plum rain period and little plum rain. There was little rain in summer, and there was a serious summer drought. It rained continuously after autumn, with more rainfall. The average temperature in each month of the year is higher. The number of high temperature days in midsummer is less than normal. Sunshine time is close to normal.

Precipitation: The annual precipitation is close to normal, but the monthly precipitation is unevenly distributed, 7 months less than normal and 5 months more than normal. The rainfall in March, April and July is more than 40% less than normal, of which March is 65.5% less, while 1, 1, 1 are more than 40% more than normal, and1rainfall is/of normal. There were two droughts in Nanjing during the year: the first time was from late February to early May, and the precipitation was 60-70% less than normal, which was rare in the same period in 50 years. It has seriously affected the growth of spring sowing and summer mature crops. In the second stage, from late June to early August, the amount of plum rains was 70% ~ 80% less than normal, and there was still little rain after the plum blossom, resulting in severe summer drought and summer drought. After autumn, it rained continuously in Nanjing because of the gentle circulation in the mid-latitude area and the influence of warm and humid airflow in the southwest. From September to early February in 12, there were four consecutive rainy days, with the longest rainy period being 14 days and the shortest being 8 days. Almost the whole autumn is spent in rainy weather. In late June, there was continuous rainfall of 14 days in 65438+ 10, exceeding the extreme value of the same period in 50 years. It has a serious impact on rice harvesting, rape transplanting and wheat sowing.

Temperature: The annual average temperature rises month by month. In winter, the temperature was 2.9 degrees and 2.0 degrees higher than normal in the first half of June 5438+ 10, February 9 and March 9, respectively; in the second half of June 5438+ 10, the temperature was10.5 degrees lower than normal on April 9, and it was 3.2 degrees lower than normal on May 9. 65438+1October 25-27, the average temperature in Nanjing was below minus 4 degrees for three consecutive days, which caused Xuanwu Lake to freeze, which was unprecedented in the past 20 years. The average temperature in spring is unusually high, and the seasonal average temperature is 16.8 degrees. The average temperature in March was 4 degrees higher than normal, ranking first since 1905. The average temperature in April was 14.5 degrees, the second in the same period since 1905. Although the high temperature in summer and autumn has weakened, it is still about 1 degree higher than normal. The extreme maximum temperature in the whole year is 37.6 degrees, which is close to normal. The number of high temperature days > 35 degrees is 9 days, which is more than normal 1999, but still less than normal, and there is no continuous high temperature weather in midsummer.

Sunshine: The sunshine hours in the whole year are 222 hours less than normal. Among them, there are three months of abundant sunshine in spring and July in midsummer, and the sunshine time in each month is 25 ~ 34 hours more than normal. From August to 65438+February, the sunshine hours are less than normal: in August, 10,1,12, the sunshine hours are less than 30 hours, especially 10, and the monthly sunshine hours are less than half of normal.

Other important weather: (1) heavy snow: 65438+1October 24th. Due to the influence of strong cold air in the north, there was heavy snow in Nanjing, with the depth of 8 cm, which had a great impact on transportation and people's lives. Nearly 40 flights at Lukou Airport were grounded, more than 900 passengers were stranded, and the expressway was once closed. (2) Rainstorm and gale: There were five rainstorms in Nanjing, which were June 2-3, July 28, August 19, September 25-26, June 10 and June 1 day. Among them, the most serious impact on Nanjing was June 2 ~ 3, with rainfall of1.43mm and strong storms. More than 20 sections of Nanjing urban area were seriously flooded, and seven 65438+ 100 kV lines failed, resulting in a large-scale power outage and many trees were blown down or broken. Although the rainfall in Nanjing on July 28th did not meet the rainstorm standard, many roads were flooded for a short time due to the rainstorm, and the water depth under the Huang Jiawei Railway Bridge reached 1 meter. In addition, in September and June 10, the magnitude of rainstorm is rare in the same period in history. (3) Fog: There are 8 foggy days in the whole year, which are March 2nd,165438+1October 2nd and 65438+February 4th. Among them,165438+1October 25th suffered serious losses. On that day, Nanjing was shrouded in fog, the expressway was partially closed, and 33 flights at the airport were delayed. In one day, there were 9 serial crashes in Ninglian and Tong Ning Expressway, and 24 cars collided in a serial way, killing 4 people, seriously injuring 4 people and slightly injuring 25 people, which once caused traffic jams. (4) Gale and sandstorm: On March 27th and 28th, due to the influence of Mongolian cyclone moving eastward and southward, a northerly wind accompanied by sandstorm appeared in Nanjing. On the afternoon of the 27th, yellow mud rained in the urban area, causing serious air pollution. (5) Typhoons: There are five typhoons that affect Nanjing throughout the year, and the wind and rain have little impact.

Climatological information of Nanjing:

Month: 65438+ February, March, May, June, July, August, September, 65438+ October, 65438+ October, 65438+ February.

Average maximum temperature (Celsius) 196 1- 1990

7.0 8.4 13.5 20. 1 25.3 29.0 32.0 32.2 27.2 22. 1 15.9 9.7

Average minimum temperature (Celsius) 196 1- 1990

- 1.6 0.0 4.4 10.3 15.7 20.4 24.6 24.2 19. 1 12.6 6. 1 -0. 1

Rainfall (mm) 196 1- 1990

29 48 69 87 96 159 188 124 95 60 56 25

Rainfall days 196 1- 1990

7 9 1 1 12 10 1 1 13 1 1 10 8 8 6