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Monthly climate in Ketchikan, Alaska, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Ketchikan features a oceanic climate (Cfb).Temperatures typically range between 2 °C (36 °F) and 14 °C (58 °F) through the year, but rarely can drop to -10 °C (15 °F) or can rise to as high as 22 °C (72 °F).The average annual precipitation amounts to about 3122 mm (122.9 inches) and receives 212 rainy days on the 1 mm (0.04 inches) threshold annually.Ketchikan enjoys an average of 1964 hours of sunshine throughout the year, and daylight varies from 7 hours 10 minutes to 17 hours 20 minutes per day.

Monthly average temperatures in Ketchikan, Alaska, United States §

The warmest months in Ketchikan are July, August and September, with daily mean temperatures ranging from 12 to 14 °C (55 - 58 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 2 to 3 °C (36 - 38 °F) throughout the day. On average each year, Ketchikan experiences 0 days above 25 °C (77.0 °F) and 25 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Ketchikan, Alaska, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 8°C
(47°F)		 8°C
(47°F)		 14°C
(57°F)		 14°C
(57°F)		 18°C
(65°F)		 22°C
(72°F)		 22°C
(71°F)		 22°C
(72°F)		 19°C
(67°F)		 14°C
(57°F)		 11°C
(51°F)		 9°C
(49°F)
Mean maximum 7°C
(46°F)		 7°C
(45°F)		 8°C
(47°F)		 12°C
(54°F)		 16°C
(60°F)		 19°C
(66°F)		 20°C
(68°F)		 21°C
(69°F)		 17°C
(63°F)		 12°C
(54°F)		 10°C
(50°F)		 9°C
(48°F)
Average high 4°C
(39°F)		 3°C
(38°F)		 5°C
(41°F)		 7°C
(45°F)		 10°C
(51°F)		 13°C
(55°F)		 15°C
(60°F)		 16°C
(60°F)		 14°C
(57°F)		 9°C
(49°F)		 7°C
(44°F)		 4°C
(40°F)
Daily mean 3°C
(37°F)		 2°C
(36°F)		 4°C
(39°F)		 6°C
(43°F)		 9°C
(48°F)		 11°C
(53°F)		 14°C
(57°F)		 14°C
(58°F)		 12°C
(55°F)		 8°C
(47°F)		 6°C
(43°F)		 3°C
(38°F)
Average low 2°C
(35°F)		 1°C
(34°F)		 2°C
(36°F)		 4°C
(40°F)		 8°C
(46°F)		 10°C
(51°F)		 13°C
(55°F)		 13°C
(56°F)		 11°C
(53°F)		 7°C
(46°F)		 5°C
(41°F)		 2°C
(37°F)
Mean minimum -6°C
(22°F)		 -5°C
(24°F)		 -2°C
(29°F)		 1°C
(35°F)		 5°C
(42°F)		 8°C
(47°F)		 11°C
(52°F)		 11°C
(52°F)		 9°C
(48°F)		 5°C
(41°F)		 1°C
(34°F)		 -3°C
(28°F)
Minimum -10°C
(15°F)		 -10°C
(15°F)		 -4°C
(25°F)		 -0°C
(32°F)		 4°C
(40°F)		 7°C
(44°F)		 10°C
(50°F)		 10°C
(50°F)		 8°C
(46°F)		 3°C
(38°F)		 -0°C
(32°F)		 -10°C
(15°F)

Compare climate in Ketchikan with other places

Compare temperature, precipitation, sunshine, UV index in Ketchikan, Alaska, United States with other places around the world.

Monthly average precipitation in Ketchikan, Alaska, United States §

Ketchikan usually has the most precipitation in October, November and December, with an average of 21 rainy days and 362 mm (14.3 inches) of precipitation per month.The driest months in Ketchikan are February, May and July. On average, 157 mm (6.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Ketchikan, Alaska, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 306 (12.1) 168 (6.6) 221 (8.7) 218 (8.6) 141 (5.6) 216 (8.5) 162 (6.4) 302 (11.9) 302 (11.9) 331 (13.0) 410 (16.1) 345 (13.6)
Average precipitation days (≥ 1 mm) 18 14 19 16 15 18 14 17 17 20 23 21

Monthly sunshine hours in Ketchikan, Alaska, United States §

The sunniest months in Ketchikan are May, June and July, when the sun shines an average of 7 hours 53 minutes a day.Least sunny months in Ketchikan: January, November and December receive an average of 1 hours 57 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Ketchikan, Alaska, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 47 128 173 216 245 232 248 223 184 132 69 63
Mean daily daylight hours 7h 48m 9h 40m 11h 55m 14h 13m 16h 15m 17h 20m 16h 43m 14h 51m 12h 38m 10h 21m 8h 17m 7h 10m

Solar UV radiation in Ketchikan, Alaska, United States §

Ketchikan experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 7 - 8, which corresponds to the High / Very High category of sun exposure.January, November and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 1. For more detailed information, check out our hourly Ketchikan UV Index data.

Average daily maximum UV levels by month for Ketchikan, Alaska, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 1 2 3 5 6 7 8 7 5 3 1 1