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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]
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]
Vegetable or Fruit. When Should Plant It. Days until Harvest. Beets. March. 50 to 70. Broccoli. March. 80 to 90. Radishes. March 1 to April 15. 25 to 40. Sweet Corn. March 25 to 30
Follow this list to avoid costly mistakes.
The city straddles the boundary of USDA Plant Hardiness Zones 5b and 6a. [96] Temperature extremes have ranged from −33 °F (−36.1 °C) on January 12, 1974, up to 115 °F (46.1 °C) on July 25, 1936. [ 95 ]
Since 1981, the wettest calendar day was 3.91 inches (99 mm) on 09/09/2004. During the winter months, the plant hardiness zone is 5b with an average annual extreme minimum air temperature of −13.9 °F (−25 °C). [4] Since 1981, the coldest air temperature was −25.2 °F (−32 °C) on 01/19/1994.
North Oklahoma Botanical Garden and Arboretum: Northern Oklahoma College: Tonkawa: Oklahoma Botanical Garden and Arboretum: Oklahoma State University: Stillwater: Oklahoma City Zoo and Botanical Garden: Oklahoma City: Tulsa Botanic Garden (formerly Oklahoma Centennial Botanical Garden) Tulsa: Will Rogers Gardens: Oklahoma City: Woodward Park: Tulsa
Since 1981, the wettest calendar day has been 6.81 inches (173 mm), on September 30, 2010. During the winter months, the plant hardiness zone is 5b, with an average annual extreme minimum air temperature of −10.1 °F (−23 °C). [28] Since 1981, the coldest air temperature has been −21.6 °F (−30 °C), on January 21, 1994.