duration of frost-free period [农] 无霜期
length of frost free period 无霜期间
four-months frost-free period 四个月无霜期
The smoke days and the frost-free period increase, while sunshine hours decreased.
烟霾日数、无霜期呈增加趋势，而日照时数为减少趋势。
Change at the annual frost-free period 100-160 days, the distribution of the trend of growing on the grounds east to west.
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。
Chenghai is located in the subtropical zone, a subtropical monsoon climate, warm and pleasant, very hot short, a long frost-free period, the Four Seasons is not clear.
澄海区地处亚热带，属南亚热带季风气候，温暖宜人，酷热期短，无霜期长，四季不甚分明。
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