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This update includes revised maps for each of the 50 states. ... On the 2012 Plant Hardiness Zone map, Greater Columbus (and a good portion of the rest of Ohio) was in Zone 6a, where the average ...
According to the USDA, these zones are "based on the average annual extreme minimum winter temperature." They are displayed as "10-degree F zones ranging from zone 1 (coldest) to zone 13 (warmest ...
In 2006, the Arbor Day Foundation released an update of U.S. hardiness zones, using mostly the same data as the AHS. It revised hardiness zones, reflecting generally warmer recent temperatures in many parts of the country, and appeared similar to the AHS 2003 draft. The Foundation also did away with the more detailed a/b half-zone delineations. [6]
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Hopkins' bioclimatic law states that in North America east of the Rockies, a 130-m (400-foot) increase in elevation, a 4° change in latitude North (444.48 km), or a 10° change in longitude East (two-thirds of a time zone) will cause a biological event to occur four days later in the spring or four days earlier in the fall. [1]
Temperatures often exceed 100 °F (38 °C), even 110 °F (43 °C), on hot summer afternoons but rarely dip below 32 °F (0 °C) on cold winter nights. The valley lies within plant hardiness zones 9b and 10a. [6] Late spring and early summer mornings are often overcast due to the formation of a marine layer off the coast that moves inland ...
The new data is based on 1991-2020 GIS data collected from over 13,000 weather stations.
Fremontodendron 'California Glory' — lemon-yellow flowers with a reddish tinge, grows 20 feet (6.1 m) in height by 20 feet (6.1 m) in width. It is the winner of the Award of Garden Merit from the California Horticultural Society in 1965, and received a First Class Certificate from the Royal Horticultural Society in 1967.
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