day without frost

• 无霜日

day without frost的用法和样例：

例句

1. The winter and early spring temperatures at De Hoge Veluwe have increased in recent decades, although there has been no change in frost days.
   近数十年来，尽管侯格维陆威的霜日天数没有变化，但冬天和初春的温度已经上升。