Climate Comfort Score
47/100
Moderate
2026 data Public-data reference. official source
Ketchikan, AK Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991-2020 normals →
30-year climate normals from 2 weather stations (1991-2020).
Ketchikan, Alaska has an average annual temperature of 46°F and a climate comfort score of 47/100 (Moderate). Annual precipitation totals 149.5". Based on NOAA 30-year normals (1991–2020).
Avg Temperature
46°F (8°C)
Avg High
51°F
Avg Low
41°F
Annual Precip
149.5"
Comfort Score
47/100
Moderate
Avg Annual Temperature
46°F
30-year mean (NOAA NCEI)
Annual Precipitation
149.5"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Ketchikan) 47.0%
National median (≈55)
PlainClimate composite — temperature mildness, humidity, precipitation, extreme-weather frequency. Moderate for the Ketchikan area.
Warming context for Ketchikan
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for Ketchikan captures average conditions across the spread shown — the most recent decade is warmer than the 30-year mean.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 40°F (4°C) | 32°F (0°C) | 36°F (2°C) | 16.2" | 15.0 | 0.0 |
| February | 41°F (5°C) | 32°F (0°C) | 36°F (2°C) | 11.8" | 15.6 | 0.0 |
| March | 44°F (6°C) | 32°F (0°C) | 38°F (3°C) | 11.0" | 15.7 | 0.0 |
| April | 50°F (10°C) | 37°F (3°C) | 44°F (6°C) | 10.3" | 6.8 | 0.0 |
| May | 57°F (14°C) | 43°F (6°C) | 50°F (10°C) | 8.7" | 1.4 | 0.0 |
| June | 61°F (16°C) | 49°F (10°C) | 55°F (13°C) | 7.0" | 0.0 | 0.0 |
| July | 65°F (18°C) | 53°F (12°C) | 59°F (15°C) | 7.3" | 0.0 | 0.0 |
| August | 65°F (18°C) | 53°F (12°C) | 59°F (15°C) | 11.3" | 0.0 | 0.0 |
| September | 59°F (15°C) | 48°F (9°C) | 54°F (12°C) | 14.3" | 0.1 | 0.0 |
| October | 51°F (11°C) | 41°F (5°C) | 46°F (8°C) | 18.4" | 3.1 | 0.0 |
| November | 44°F (7°C) | 36°F (2°C) | 40°F (4°C) | 17.1" | 9.3 | 0.0 |
| December | 40°F (5°C) | 33°F (0°C) | 36°F (2°C) | 16.3" | 14.4 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 16.2"
22.0 days with precipitation
February 11.8"
17.0 days with precipitation
March 11.0"
20.6 days with precipitation
April 10.3"
19.4 days with precipitation
May 8.7"
16.1 days with precipitation
June 7.0"
16.4 days with precipitation
July 7.3"
16.0 days with precipitation
August 11.3"
16.8 days with precipitation
September 14.3"
19.5 days with precipitation
October 18.4"
22.8 days with precipitation
November 17.1"
23.6 days with precipitation
December 16.3"
22.4 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
October 23
50% probability date
Last Spring Freeze
April 22
50% probability date
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,917
Higher = more heating needed
Cooling Degree Days
16
Higher = more cooling needed
Warmest Month
August
Coldest Month
January
Humidity & Wind
Monthly averages from hourly observations
| Month | Humidity | Wind (mph) | Clear Sky % | Overcast % |
|---|---|---|---|---|
| January | 83% | 8.8 | -6659% | -6645% |
| February | 76% | 8.1 | 29% | 53% |
| March | 79% | 8.4 | 21% | 56% |
| April | 76% | 8.9 | -3317% | -3302% |
| May | 77% | 8.3 | -4569% | -4557% |
| June | 80% | 8.1 | N/A | N/A |
| July | 80% | 7.9 | -7910% | -7907% |
| August | 86% | 7.4 | N/A | N/A |
| September | 87% | 7.8 | N/A | N/A |
| October | 85% | 8.2 | N/A | N/A |
| November | 85% | 8.2 | N/A | N/A |
| December | 84% | 8.4 | N/A | N/A |
Related Data
PlainEnviro
EPA environmental data — pollution, water quality, and environmental health by location
PlainCarbon
Carbon emissions data — greenhouse gas reporting and facility-level CO2 data
PlainHazard
Natural disaster data — weather-related hazards, FEMA declarations, and risk profiles
PlainAirData
EPA air quality data — AQI readings, pollutant levels, and air quality trends
Climate Guides
Climate Insight: Ketchikan, AK
The NOAA 1991–2020 climate normals describe Ketchikan, Alaska as a location with an annual average temperature of 46°F, ranging from a mean daily high of 51°F to a mean daily low of 41°F. August is typically the warmest month of the year, while January is the coldest. These thirty-year averages, computed from 2 weather stations, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Ketchikan receives roughly 149.5 inches of precipitation each year, predominantly as rainfall. Growing-season length varies with elevation and microclimate, with the last spring freeze near April 22 and the first fall freeze near October 23. For energy use, 6,917 heating degree days and 16 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Ketchikan scores 47/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Use the monthly tables above to plan around specific windows — shoulder seasons for mild highs and lows, peak summer for August-driven heat, or deep winter for January-driven cold. All figures here are thirty-year averages: any single year may run warmer, wetter, drier, or cooler than the normal, so treat them as planning guidance rather than forecasts.
Frequently Asked Questions
What is the average temperature in Ketchikan, AK? ▼
The average annual temperature in Ketchikan, Alaska is 46°F. The warmest month averages 65°F (18°C) and the coldest averages 32°F (0°C).
How much rain does Ketchikan get? ▼
Ketchikan receives 149.5 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Ketchikan? ▼
Ketchikan has a climate comfort score of 47/100 (Moderate). This score considers temperature mildness, humidity, precipitation, and extreme weather frequency.
When is the growing season in Ketchikan? ▼
Growing season data is not available for Ketchikan.
How much energy does heating and cooling require in Ketchikan? ▼
Ketchikan has 6,917 heating degree days and 16 cooling degree days annually. Higher heating degree days indicate greater winter energy demand, while higher cooling degree days indicate greater summer cooling needs.
Where does this Ketchikan climate data come from? ▼
All climate data comes from NOAA U.S. Climate Normals v1.0.1, covering the 30-year period from 1991 to 2020. Data is collected from 2 weather stations. These 30-year averages are the standard reference for typical weather conditions.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USW00025325. For informational purposes only.
Read our methodology — how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
