According to Chapter 7 of the national standard “Code for Construction and Acceptance of Concrete Structures” (GB50204), based on local temperature data for many years, when the daily average outdoor temperature remains below 5 ℃ for 5 consecutive days, concrete construction should enter the winter season.
At this point, the first day when the temperature remains stable below 5 ℃ for 5 consecutive days is considered the initial day for winter construction.
Similarly, when the temperature rises, the end of winter construction is the day when the temperature remains stable above 5 ℃ for 5 consecutive days.
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