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Solar term; Term Longitude Dates Lichun: 315° 4–5 February Yushui: 330° 18–19 February Jingzhe: 345° 5–6 March Chunfen: 0° 20–21 March Qingming: 15°
First frost dates are based on historical averages, but of course, weather is unpredictable. It's estimated that a frost may occur earlier than the given date 30% of the time.
In the southern part of Finland, -15 °C (5 °F) is considered the limit of severe frost. The thermometer in the picture shows -17 °C (1.4 °F). The English word "frost" has 2 base meanings that are related to each other but nevertheless sufficiently different: temperature of air below the freezing point of water (ca 273 K)
According to National Weather Service climate data, the average last frost date for final frost in Columbus is April 18, although it is more likely the final date will be around May 5, according ...
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X 1 = monthly mean of the daily minimum temperatures (°C) of the coldest month; X 2 = mean frost free period above 0 °C in days; X 3 = amount of rainfall (R) from June to November, inclusive, in terms of R/(R+a) where a=25.4 if R is in millimeters and a=1 if R is in inches; X 4 = monthly mean of the daily maximum temperatures (°C) of the ...
Black frost (or "killing frost") is not strictly speaking frost at all, because it is the condition seen in crops when the humidity is too low for frost to form, but the temperature falls so low that plant tissues freeze and die, becoming blackened, hence the term "black frost".
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