Ketchikan Gateway Borough Climate
Ketchikan Gateway Borough, Alaska
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
46.6°F
Annual Precip
153.4"
Annual Snowfall
—
Extreme Heat Days
0
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
1,043
Limited to cold-tolerant varieties
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Ketchikan Gateway Borough
Climate Verdict
Ketchikan Gateway Borough has a cool, averaging 46.6°F annually, very wet conditions receiving 153.4 inches of precipitation annually, rare extreme heat with only 0.15 days above 90°F annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 35.7°F. summers are cool, with July averaging only 59.5°F. The climate is remarkably stable year-round, with only a 24°F difference between January and July. January is typically the coldest month and August the warmest.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Ketchikan Gateway Borough. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Ketchikan Gateway Borough is 10.9°F warmer than the Alaska statewide average of 35.7°F, it is also noticeably wetter, receiving 99.9 inches more precipitation than the state average.
Climate Profile
About Ketchikan Gateway Borough Weather
One of America’s Wettest Regions
Ketchikan averages 46.6°F annually, which is mild for Alaska but defined by a massive 153.4 inches of precipitation. This is nearly triple the state average and far beyond the national median.
The Warm, Wet Edge of Alaska
Ketchikan is over 10 degrees warmer than the state average of 35.9°F. Its maritime climate ensures that even in January, temperatures average a relatively warm 35.7°F.
Wetter than its Coastal Peers
While Juneau is considered wet at 92.5 inches of rain, Ketchikan receives 153.4 inches, making it significantly Rainier. It remains the warmest major region in the state with an average of 46.6°F.
A Season of Endless Rain
The borough sees no extreme heat days, with summer averages hovering around 58.5°F. Winter is mild for the latitude, averaging 36.3°F, though snowfall data for the borough is not currently available.
Waterproofing is the Top Priority
In a region with 153.4 inches of rain, industrial-grade waterproof gear is a daily necessity. Home maintenance must prioritize drainage and mold prevention due to the persistent high humidity.
Frequently Asked Questions
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Data sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.