# US Climate Zones (ASHRAE 169)

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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**&#x20;

Hot-Dry – Hot, arid regions (e.g., Phoenix, AZ).

### **Zone 2A**&#x20;

Warm-Humid – Warm with high humidity (e.g., Houston, TX).

### **Zone 2B**:&#x20;

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**&#x20;

Mixed-Humid – Distinct seasons, humid (e.g., Washington, DC).

### **Zone 4B**:&#x20;

Mixed-Dry – Seasonal with dry air (e.g., Albuquerque, NM).

### **Zone 4C**:&#x20;

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).