What is the weather like in Ningbo?

Ningbo belongs to the northern subtropical humid monsoon climate zone. The climate is mild and humid, with four distinct seasons, abundant rainfall, and obvious alternations of winter and summer monsoons.

The four seasons in Ningbo are long winter and summer (about 4 months each), and short spring and autumn (about 2 months each). If the average temperature is 10 to 22°C, it is spring and autumn, >22°C is summer, and <10°C is winter. Generally, spring begins in the sixth tempo of March, and summer begins in the first tempo of June. The sixth tempo of September is autumn, and the sixth tempo of November is winter. However, in the western mountainous areas, winter is one month longer than in the plains, while summer is nearly a month shorter. Spring and autumn are slightly longer than in the plains, meaning that spring comes late and autumn ends early. In winter, due to the control of the Mongolian high pressure, the cold air from Siberia is constantly replenished and moves southward, resulting in dry and cold weather. The northerly wind prevails at this time. In summer, controlled by the Pacific subtropical high, southeasterly winds prevail, and there are often continuous sunny and hot weather. In addition to local thundershowers, there will also be large precipitation processes affected by tropical weather systems such as typhoons or easterly waves. Spring is the transitional season when the winter monsoon changes to the summer monsoon. Due to the frequent intersection of cold and warm air in the middle and lower reaches of the Yangtze River, the weather is unpredictable, sometimes cold and sometimes hot, rainy and thunderstorms and coastal winds often occur. Autumn is the direction of the summer wind. During the transition season between the winter monsoon and the winter monsoon, the climate is relatively cool, but autumn tigers sometimes occur. Because small strands of cold air often move southward, frontal activity begins to increase, and rainy weather often occurs. Because Ningbo is close to mountains and seas, its specific geographical location and natural environment make climate differences obvious and complex in various places, but at the same time, it also forms a variety of climate types. For example, each island has maritime climate characteristics of small annual temperature range, warm winters and cool summers, humid climate, good lighting conditions, and rich wind resources, but is susceptible to the influence of typhoons; the western mountainous areas have obvious three-dimensional climate characteristics, with lighting, temperature , precipitation changes significantly with height, and water resources are relatively abundant, but they are also prone to floods or droughts; while vast plain areas are significantly affected by monsoons. Ningbo's rich and diverse climate resources provide extremely favorable natural conditions for the development of diversified businesses. The multi-year average temperature in Ningbo is 16.3℃, July is the hottest, January is the coldest, and the extreme maximum temperature is 39. ℃, high temperature weather is more in the north than in the south, more inland and less along the coast; the extreme minimum temperature is -11.1 ℃, and there are not many low temperature days. The first day when it stably passes 10 ℃ is at the end of March, and the last day is at the end of November. The duration is about There are 237 days with an average accumulated temperature of about 5100°C. The accumulated temperature in mountainous areas is about 1000°C less than that in plains.

The annual average precipitation is about 1,400 mm, and mountains and hills are generally about 30% more than plains; the main rainy seasons occur from March to June (that is, spring rains continue with plum rains, and rainy days generally exceed half a month) and August ~September (that is, typhoon rain and autumn rain, the monthly rainy day is also nearly half a month). In Ningbo, plum blossoms usually bloom in mid-June, with the earliest being in late mid-May and the latest being the end of June. The plum blossoms are generally in early July, with the earliest being mid-June and the latest being early August. Ningbo is a humid and semi-humid area, that is, the budget (precipitation and evaporation) is basically balanced; in terms of regional distribution, the north is relatively drier than the south.

The average annual sunshine is more than 1,900 hours. Since the region spans nearly 1.5 latitudes, the regional distribution is more north than south; and because of more clouds and fog in the western mountainous areas, the average number is 10% less than that in the plains.

Due to the obvious alternation of monsoons throughout the year, there are often low temperatures and rain in spring and autumn; heavy rains and floods in the flood season; droughts, typhoons, hail, and strong winds in summer and autumn; and frosts, cold waves and other disasters in winter. The occurrence of severe weather will directly affect agricultural production.

Typhoons that affect Ningbo are mainly concentrated from July to September (process rainfall >=50 mm or wind speed >=17 m/s), with an average of 2.8 per year. There is almost one typhoon every few years (with rainfall >= 200 mm) that can cause severe impacts. Since 1953, there have been ***4 typhoons that have made landfall in Ningbo. The storm surge caused by typhoons is extremely harmful. For example, Typhoon No. 5612 (also known as the Great Typhoon on August 1) caused heavy losses in Xiangshan; and Typhoon No. 9711 caused losses of more than 4.5 billion yuan in the city.

Heavy rains (daily rainfall 50 mm) average 2 to 5 heavy rains per year, mainly occurring in the plum rains from June to early July and typhoon rains from August to September, mostly in September; the geographical distribution is Ninghai At most, heavy rains often cause floods, such as the floods caused by heavy rains in Ninghai on July 30, 1988.

Droughts mostly occur from July to September after the plum blossoms appear, especially in the hilly and mountainous areas of Ninghai and Xiangshan and Cixi where the precipitation utilization rate is not high. It usually occurs once every 2 to 3 years and 4 to 4 in other areas. Once every 5 years: However, droughts can sometimes occur throughout the year. In some years, there are summer droughts followed by autumn droughts, and in other years, there are autumn droughts followed by winter droughts.

The probability of hail and tornadoes in Ningbo is low. Hail generally occurs in spring, summer and autumn from March to September, mostly from noon to evening. Hail in Ningbo City is mainly distributed in Yuyao, Cixi, Yinxian, Zhenhai and other places in the northern region, followed by Fenghua; tornadoes mainly occur from June to September, with the majority occurring in July. Most of them occur in Yuyao and Cixi in Ningbo City. On September 16, 1983, a tornado occurred in Simen, Yuyao and Zhouxiang, Cixi at 3:42 pm, causing the collapse of nearly 2,000 houses and killing 21 people. Low temperature and rain generally refer to late spring cold in spring and low temperature in spring and autumn.

The late spring cold refers to the cloudy and rainy process after Qingming (April 5) when the daily average temperature is =0.0 mm and the sunshine duration is <2 hours. It occurs an average of 1.1 times a year; low temperature in autumn refers to the process in which the daily average temperature is <=20°C or 22°C for three consecutive days in mid-to-late September, causing the grain filling and maturation process of japonica rice and late hybrid rice to be delayed, causing the grain filling to be incomplete, resulting in Production reduction occurs once every 4 years on average, but is unevenly distributed. Sometimes it occurs continuously, and sometimes it occurs only once every 8 to 9 years. Frost is divided into early frost and late frost. The lowest temperature the day after April 1st (4°C) is a late frost, which occurs once in three years. The first frost in Ningbo usually occurs in mid-November, and the last frost occurs in late March or early April. Snow generally appears from late November to early March of the following year. From January to February at most, there are 6 to 10 days of snowfall on average and 2 to 6 days of snow accumulation on average.

Thunderstorms generally occur from March to October, with an average of 30 to 47 days per year. The first thunderstorm is usually in early March, and the earliest is in late February; the final thunderstorm is usually in mid-October, and the latest can be in early December.