指一年中终霜后至初霜前的一整段时间。在这一期间内,没有霜的出现。农作物的生长期与无霜期有密切关系。无霜期愈长,生长期也愈长。无霜期的长短因地而异,一般纬度、海拔高度愈低,无霜期愈长。
烟霾日数、无霜期呈增加趋势,而日照时数为减少趋势。
The smoke days and the frost-free period increase, while sunshine hours decreased.
年平均气温在摄氏十六至十八度之间、四季分明、雨量充沛、无霜期长。
The annual temperature is between sixteen and eighteen degrees, with distinct four seasons, abundant rain and long frostless period.
全年无霜期变化在100—160天之间,分布趋势为由东向西逐渐增长。
Change at the annual frost-free period 100-160 days, the distribution of the trend of growing on the grounds east to west.
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