Sunset Climate Zones of the Klamath-Trinity

The climate zones listed here developed by Sunset Gardening are far more detailed than USDA climate zones, taking into account factors such as frost-free days, humidity, prevailing winds, effects of ocean, elevation and regional weather patterns.  (USDA climate zones are based only on annual average minimum temperature).  These climate zones paint a fuller picture of our regional climate and are much more useful for describing and comparing climate in our area.  Identifying your climate zone will clarify opportunities and challenges in your region and help in adjusting dates for planting, harvesting etc.  

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