In winter, the climate in Zhongshan is very dry. How long is it?

Zhongshan is located in the south of the Tropic of Cancer, on the northern edge of the tropics, with abundant sunshine, sufficient heat and warm climate. The solar radiation angle is large, and the temperature is high all year round. The annual solar radiation is 105.3 kcal/cm? , in which the scattered radiation is 57.7 kcal/cm? The average direct radiation is 45.5 kcal/cm? . The annual total solar radiation is the strongest in July, reaching 12 kcal/cm? The weakest is February, only 5.6 kcal/cm? . Sufficient illumination time, with high-yield light energy utilization potential. Average annual illumination 1843.5 hours, accounting for 42% of the annual illumination.

The least annual light hours are from early February to early April, with an average of 2.8 hours per day, and the most are from July to 10, with an average of 6.7 hours per day. The climate is warm and suitable for planting all year round. The average temperature over the years is 265438 0.8℃. The interannual average temperature has not changed much. The hottest year is July, with an average daily temperature of 28.4℃. The coldest month is 65438+ 10, and the average daily temperature is 13.2℃. The frost-free period is long and the frost days are few, with an average of only 3.5 days per year. Under the regulation of ocean airflow, the climate change in winter is alleviated. Relative humidity and evaporation. The average relative humidity for many years is 83%, the maximum value is 86% of 1957, and the minimum value is 8 1% of 1977. In a year, it changes greatly from May to June, and changes little from 65438+February to 65438+1October. The annual average evaporation is 1448. 1mm, the maximum is 197 1 year is 1605. 1mm, and the minimum is 1965/kloc.

There are many kinds of meteorological disasters in Zhongshan city, which may occur all year round, including cold wave, low temperature frost, high temperature and heat, tropical cyclone; There are both storms and floods, as well as droughts and salty tides; There are not only lightning disasters, but also strong convective weather such as tornadoes and hail. Major meteorological disasters, such as torrential rain, frontal attack of tropical cyclone, catastrophic flood, severe drought and severe chilling injury, also occur from time to time in Zhongshan.