spell of weather

例句：

1. 1. The spell of weather can vary greatly from day to day.
   天气的变化一天比一天大。
2. 2. This region has a long-lasting spell of rain.
   这个地区有一个持续的雨季。
3. 3. The weather spell is forecasted for the next few days.
   天气预报显示未来几天会有好天气。