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西双版纳的山间盆地和谷地,昼间热量易于积聚温度高,夜间近地面的气温因辐射冷却变重之后,成为冷气流向盆地或谷地的低处沉降,这种冷空气的潜入,使暖空气冷却易于发生雾。平均每年出现雾日最多的地方达160天,(勐仑),最少的地方也可达110天(勐遮),而多数地方平
The mountain basins and valleys in Xishuangbanna are prone to accumulate heat at high temperatures during the day. After nighttime, the temperature near the ground becomes heavier due to radiant cooling, causing the cold air to flow to the lower part of the basin or valley. The cold air infiltrates and warm air is cooled Prone to fog. The average annual occurrence of fog day up to 160 days, (Menglun), at least for up to 110 days (Meng cover), and most of the local level