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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".
California and Nevada saw their lowest temperatures on record: −45 °F (−42.8 °C) at Boca on January 20 and −50 °F (−45.6 °C) at San Jacinto on January 8. [28] 1940. January 1940 Southern United States cold wave – Late January saw record-breaking cold and snow across the Southern United States.
February marks the midpoint of winter, and with spring just over the horizon, many gardeners are dreaming of sunny days and dirty fingernails. A week before the last frost date, begin to “harden ...
There is a 30% chance that frost can occur after the spring frost date or before the fall frost date. Frost is typically predicted when air temperatures hit 32 degrees. However, that doesn't mean ...
The maximum frost depth observed in the contiguous United States ranges from 0 to 8 feet (2.4 m). [1] Below that depth, the temperature varies, but is always above 0 °C (32 °F). Alternatively, in Arctic and Antarctic locations the freezing depth is so deep that it becomes year-round permafrost , and the term " thaw depth " is used instead.
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