# US Climate Zones (ASHRAE 169)
The IECC (International Energy Conservation Code) divides the U.S. into 8 climate zones, based on temperature, humidity, and rainfall, ranging from hot-humid (Zone 1) to subarctic (Zone 8). ### **Zone 1A** Hot-Humid – Very warm and moist (e.g., Miami, FL). ### **Zone 1B** Hot-Dry – Hot, arid regions (e.g., Phoenix, AZ). ### **Zone 2A** Warm-Humid – Warm with high humidity (e.g., Houston, TX). ### **Zone 2B**: Warm-Dry – Warm and dry climate (e.g., El Paso, TX). ### **Zone 3A** Hot-Humid – Less intense than Zone 1A (e.g., Atlanta, GA). ### **Zone 3B** Hot-Dry – Hot, drier areas (e.g., southern California). ### **Zone 3C** Coastal Marine – Moderate temps, moist air (e.g., San Francisco, CA). ### **Zone 4A** Mixed-Humid – Distinct seasons, humid (e.g., Washington, DC). ### **Zone 4B**: Mixed-Dry – Seasonal with dry air (e.g., Albuquerque, NM). ### **Zone 4C**: Marine – Cool summers, mild winters (e.g., Portland, OR). ### **Zone 5A** Cool-Humid – Cold winters, humid summers (e.g., Chicago, IL). ### **Zone 5B** Cool-Dry – Similar to 5A but drier (e.g., Denver, CO). ### **Zone 5C** Marine – Coastal, cool (e.g., Seattle, WA). ### **Zone 6** Cold-Humid – Colder winters, humid (e.g., Minneapolis, MN). ### **Zone 6B** Cold-Dry – Colder and drier (e.g., Helena, MT). ### **Zone 7** Very Cold – Long, harsh winters (e.g., Duluth, MN). ### **Zone 8** Subarctic/Arctic – Extremely cold (e.g., Fairbanks, AK). --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.betterbuilding.io/support-and-training/other-support/faqs/design-and-specification/climate/us-climate-zones-ashrae-169.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.