weather

1.关于weather和climate的不同，参见climate

2.weather前面不可用a。

3.注意in all weathers（在不论哪种天气里）中用复数形式。

4.下面各句里的this weather等于in this weather：

• Meat won't keep this weather.
• As you have a cold, you had better keep indoors this weather.
• Why are all the windows open this weather?