What does it mean to be in zone 8a?
Zone 8’s minimum average temperatures, like the other USDA zones, are ten degrees warmer than those of Zone 7. It’s also divided into two subzones: 8a and 8b. The minimum average temperature of Zone 8a is 10-15° Fahrenheit, and the minimum average temperature of Zone 8b is 15-20° Fahrenheit. The zones are then divided into ‘a’ and ‘b’ sections, with ‘a’ being the colder half and ‘b’ being the warmer half, as follows: If the average falls between 10 and 15°F, you’re in zone 8a. If the average falls between 15 and 20°F, you’re in zone 8b.Zone 4: Minimum average temperature of -30° to -20° F. Zone 5: Minimum average temperature of -20° to -10° F. Zone 6: Minimum average temperature of -10° to 0° F.Cold Hardiness zones are based on the average annual minimum temperature in a given area of the country, with USDA Zone 1 being the coldest at minus 50 degrees F and USDA Zone 11 the warmest at above 40 degrees F.Our zone 4 area is roughly equivalent to their zone 3 (minimum temperature -40 to -34°C or -40 to -30°F). The map is made from the average of these conditions over many years and changes in weather from year to year can greatly affect the growing zone.
Which area is zone 8?
Most places in the UK are USDA zone 8. Most of the coast is zone 9, as is London. Zone 7 is the coldest inland Northern and Scottish areas. The USDA plant hardiness zones are the most widely used system globally to determine planting zones. The entirety of the UK falls within USDA planting zones 6-9, which are based on average winter temperatures.