通常以地面最低温度0℃作为霜冻指标。把地面最低温度≤0℃的初、终日定为初
、终霜冻日,其间的日数为霜冻期。
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通常以地面最低温度0℃作为霜冻指标。把地面最低温度≤0℃的初、终日定为初
、终霜冻日,其间的日数为霜冻期。