December weather forecast and climate
Ketchikan, AK

Beautiful and colorful houses along the waterfront boardwalk on Creek Street in Ketchikan, Alaska
Beautiful and colorful houses along the waterfront boardwalk on Creek Street in Ketchikan, Alaska

Weather in December

December, the first month of the winter, in Ketchikan, is still a cold month, with average temperature ranging between min 31.5°F (-0.3°C) and max 35.8°F (2.1°C).

Temperature

With an average high-temperature of 35.8°F (2.1°C) and an average low-temperature of 31.5°F (-0.3°C), December is the coldest month.

Humidity

The average relative humidity in December is 84%.

Rainfall

In Ketchikan, it is raining for 18.6 days, with typically 8.7" (221mm) of accumulated precipitation. In Ketchikan, Alaska, during the entire year, the rain falls for 221.8 days and collects up to 80" (2032mm) of precipitation.

Snowfall

Months with snowfall are January through May, November and December. In December, in Ketchikan, Alaska, it is snowing for 7.4 days. Throughout December, 8.03" (204mm) of snow is accumulated. In Ketchikan, during the entire year, snow falls for 40.7 days, and aggregates up to 48.35" (1228mm) of snow.

Ocean temperature

In Ketchikan, the average seawater temperature is 45.9°F (7.7°C).
Note: Swimming in 45.9°F (7.7°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

The month with the shortest days in Ketchikan is December, with an average of 7.2h of daylight.

Sunshine

In Ketchikan, Alaska, the average sunshine is 3.5h.

UV index

Months with the lowest UV index are January, November and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 1 interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Ketchikan?

December is the coldest month in Ketchikan, with an average high-temperature of 35.8°F (2.1°C) and an average low-temperature of 31.5°F (-0.3°C).

What is the temperature in December in Ketchikan?

The average high-temperature, in December, in Ketchikan, is 35.8°F (2.1°C), while the average low-temperature is 31.5°F (-0.3°C).

What is the average humidity in December in Ketchikan?

The average relative humidity in December is 84%.

How many days does it rain in December in Ketchikan?

In Ketchikan, Alaska, in December, during 18.6 rainfall days, 8.7" (221mm) of precipitation is typically accumulated.

How much does it snow in Ketchikan in December?

In Ketchikan, in December, snow falls for 7.4 days, with typically accumulated 8.03" (204mm) of snow.

What is the ocean temperature in December in Ketchikan?

In Ketchikan, Alaska, the average seawater temperature in December is 45.9°F (7.7°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the month with the shortest days in Ketchikan?

December has the shortest days of the year in Ketchikan, with an average of 7.2h of daylight.

What is the average length of the day in December in Ketchikan?

In Ketchikan, the average length of the day in December is 7.2h.

How many hours of sunshine does Ketchikan have in December?

In Ketchikan, Alaska, the average sunshine in December is 3.5h.

What is the month with the lowest UV index in Ketchikan?

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Ketchikan, Alaska.

How high is the UV index in December in Ketchikan?

The average daily maximum UV index in December in Ketchikan is 1. A UV Index value of 2, and less, symbolizes a low health threat from the exposure to the Sun's UV rays.

Average temperature in December
Ketchikan, AK

Average temperature in December - Ketchikan, AK
  • Average high temperature in December: 35.8°F

The warmest months (with the highest average high temperature) are July and August (60.8°F).
The month with the lowest average high temperature is December (35.8°F).

  • Average low temperature in December: 31.5°F

The month with the highest average low temperature is August (52°F).
The coldest month (with the lowest average low temperature) is February (30.6°F).

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Average pressure in December
Ketchikan, AK

Average pressure in December - Ketchikan, AK
  • Average pressure in December: 29.88"

The month with the highest atmospheric pressure is July (30.06").
The month with the lowest atmospheric pressure is November (29.8").

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Average wind speed in December
Ketchikan, AK

Average wind speed in December - Ketchikan, AK
  • Average wind speed in December: 7.8mph

The windiest month (with the highest average wind speed) is January (8.7mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

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Average humidity in December
Ketchikan, AK

Average humidity in December - Ketchikan, AK
  • Average humidity in December: 84%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is May (82%).

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Average rainfall in December
Ketchikan, AK

Average rainfall in December - Ketchikan, AK
  • Average rainfall in December: 8.7"

The wettest month (with the highest rainfall) is January (9.69").
The driest month (with the least rainfall) is May (3.46").

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Average rainfall days in December
Ketchikan, AK

Average rainfall days in December - Ketchikan, AK
  • Average rainfall days in December: 18.6 days

The month with the highest number of rainy days is November (21.4 days).
The month with the least rainy days is February (14.2 days).

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Average snowfall in December
Ketchikan, AK

Average snowfall in December - Ketchikan, AK
  • Average snowfall in December: 8.03"

The month with the highest snowfall is February (13.11").
Months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in December
Ketchikan, AK

Average snowfall days in December - Ketchikan, AK
  • Average snowfall days in December: 7.4 days

The month with the highest number of snowfall days is March (10.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in December
Ketchikan, AK

Average sea temperature in December - Ketchikan, AK
  • Average sea temperature in December: 45.8°F

The best month for swimming (with the highest average sea temperature) is August (55.9°F).
The coldest month (with the lowest average sea temperature) is March (42.5°F).

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Average daylight in December /
Average sunshine in December
Ketchikan, AK

Average daylight in December / Average sunshine in December - Ketchikan, AK
  • Average daylight in December: 7.2h

The month with the longest days is June (Average daylight: 17.4h).
The month with the shortest days is December (Average daylight: 7.2h).

  • Average sunshine in December: 3.5h

The month with the most sunshine is May (Average sunshine: 7.2h).
The month with the least sunshine is January (Average sunshine: 3h).

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Average sunshine days in December
Ketchikan, AK

Average sunshine days in December - Ketchikan, AK
  • Average sunshine days in December: 8.9 days

The month with the most sunshine days is July (11.9 days).
The month with the least sunshine days is November (5.6 days).

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Average UV index in December
Ketchikan, AK

Average UV index in December - Ketchikan, AK
  • Average UV index in December: 1

Months with the highest UV index are July and August (UV index 4).
Months with the lowest UV index are January, November and December (UV index 1).

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Average cloud cover in December
Ketchikan, AK

Average cloud cover in December - Ketchikan, AK
  • Average cloud cover in December: 64

The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is May (Cloud cover 55).

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Average visibility in December
Ketchikan, AK

Average visibility in December - Ketchikan, AK
  • Average visibility in December: 6mi

Months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
Months with the lowest visibility are January, July and August (5mi).

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