景洪地区年降雨量的多寡,主要决定于西南与东南气流盛行与否,如果盛行,该年的年降雨量就偏多,否则就偏少。这是因为印缅之间的孟加拉湾是在景洪的西南面,在印缅孟加拉湾生成的低气压槽常常东移带来充沛的雨量,景洪的冬半年十一至四月份,如果印缅低气压东移频繁,这年冬春季就常常发生雷阵雨、大风、冰雹等天气,雨水就多,否则冬春季就比较干旱少雨。 The amount of annual rainfall in the Jinghong area is mainly determined by the prevalence of air currents in the southwest and southeast regions. If it prevails, the annual rainfall in that year is too large, otherwise it will be less. This is because the Bay of Bengal between India and Myanmar is in the southwest of Jinghong. The low pressure troughs generated in the Bay of Bengal of Indo-Myanmar often bring abundant rainfalls eastward. In the first half of Jinghong in November-April, Frequent frequent atmospheric pressure, frequent thunderstorms and winds, hail and other weather in winter and spring this year, more rain, or more dry and cold in winter and spring.