Wind—even the slightest of winds can prevent frost (霜冻).That’s because wind is like a spoon in your cup of tea: it stirs （搅起）things down and brings down a lot of warm air that often floats just above housetops and trees .
It may seem strange , but ice itself sometimes can protect crops from frost . Some growers actually spray their crops with water on a freezing night . Water freezes quickly on plants and then a strange thing happens . As long as ice stays wet , it can’t get colder than 32°F, a temperaure many plants can stand . By continual spraying water on the ice , the growers keep it from going below 32 degrees even if the air is much colder . This may defeat frost and saves plants .
