The weather is very changeable at this time of year.
年年在这个时候天气都变化无常。
The weather is very changeable at the moment.
现时天气变化无常。
The forecast is for changeable weather.
预报针对的是变化无常的天气。
The weather was very changeable last winter.
去年冬天天气变化无常。
My boss has a changeable character.
我的老板性格多变。