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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.
The first frost of the season will happen across the Middle Tennessee region on Tuesday and Wednesday night. Temperatures are expected to reach below freezing, said the National Weather Service.
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Memphis did try to annex this area in the mid-2000s but held it off due to an inability to move services into the area. Per Tennessee law, each county is required to set up urban growth boundaries for it cities. Because of this, Memphis (along with each suburb) has what is known as an annexation reserve that defines the eventual city limits.
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.
For practical purposes, Canada has adopted the American hardiness zone classification system. The 1990 version of the USDA Plant Hardiness Zone Map included Canada and Mexico, but they were removed with the 2012 update to focus on the United States and Puerto Rico. [8] The Canadian government publishes both Canadian and USDA-style zone maps. [37]
Tennessee covers roughly 42,143 square miles (109,150 km 2), of which 926 square miles (2,400 km 2), or 2.2%, is water. It is the 16th smallest state in terms of land area. The state is about 440 miles (710 km) long from east to west and 112 miles (180 km) wide from north to south.
The official first day of fall is Sunday, Sept. 22, at 7:44 a.m. CT/ 8:44 a.m. ET, also known as the autumnal equinox. The equinox is known as the astronomical start of the season, but there is ...