但是要记住，每年的这个时候天气变化无常，如果乌云突然降落，就很容易偏离轨道。
Do bear in mind, though, that at this time of year the weather is very changeable and if the cloud suddenly descends, it's all too easy to wander off the track.
现时天气变化无常。
这个岛国的天气变化无常，天气预报很少有准确的时候。
The weather of this island country is so changeable that the weather report is rarely correct.
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