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Many zone boundaries were changed as a result of the more recent data, as well as new mapping methods and additional information gathered. Many areas were a half-zone warmer than the previous 1990 map. [8] The 2012 map was created digitally for the internet, and includes a ZIP Code zone finder and an interactive map. [9] [10]
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.
Link - An alternative name (alias) which links to a canonical zone. Link † - A standard Link (as above). The dagger symbol (†) signifies that the zone was canonical in a previous version of the database. Historical data for such zones is still preserved in the source code, but it is not included when compiling the database with standard ...
Map showing the snowbelts around the Great Lakes of North America with 150 cm (60 in) accumulations or more during winter. The Snowbelt, Snow Belt, Frostbelt, or Frost Belt [1] is the region near the Great Lakes in North America where heavy snowfall in the form of lake-effect snow is particularly common. [2]
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 ...
There is a 50 percent probability that the first frost of the season will occur by October 21, and a 50 percent probability that the final frost will occur by April 16. [ 38 ] Climate data for Gaithersburg, MD (same zip code as North Potomac)
The arctic air mass will then move east and south, bringing the coldest air of the season from Texas to New York. A frost advisory has even been issued for parts of northern Florida, including ...
In the United States (US), the most widely used is the U.S. Department of Agriculture (USDA) system of hardiness zones based on average minimum yearly temperatures. [4] This system was developed specifically for the extremely diverse range of conditions in the US, from baking desert to frozen tundra.