Mixed-Humid (4A) Dry (4B) CDD50°F ≤ 4500 AND. 3600 < HDD65°F ≤ 5400.

What does hardiness zone 4a mean?

Zone 4: There is a minimum average temperature of -20°F to -30°F for Zone 4. Zone 4a: There is a minimum average temperature of -25°F to -30°F for Zone 4. Zone 4b: There is a minimum average temperature of -20°F to -25°F for Zone 4.

What is climate zone 3A?

A type of climate defined in the ASHRAE 169-2006 standard consisting of Climate Zone Number 3 and Climate Zone Subtype A. Climate Zone 3A is defined as Warm – Humid with IP Units 4500 < CDD50ºF ≤ 6300 and SI Units 2500 < CDD10ºC < 3500 .