Ketchikan
Alaska, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Ketchikan, AK

Beautiful and colorful houses along the iconic waterfront boardwalk on Creek Street in Ketchikan, Alaska
Beautiful and colorful houses along the iconic waterfront boardwalk on Creek Street in Ketchikan, Alaska
The first month of the winter, December, is also a wintry month in Ketchikan, Alaska, with temperature in the range of an average high of 39.9°F (4.4°C) and an average low of 30.9°F (-0.6°C).

Temperature

In December, the average high-temperature is practically the same as in November - a wintry 39.9°F (4.4°C). In Ketchikan, the average low-temperature is 30.9°F (-0.6°C).

Rainfall

In Ketchikan, in December, during 22 rainfall days, 15.6" (397.5mm) of precipitation is typically accumulated. In Ketchikan, during the entire year, the rain falls for 229 days and collects up to 153.2" (3892.3mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Ketchikan, Alaska.

Ocean temperature

In December, the average ocean temperature is 45.9°F (7.7°C). 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

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

Sunshine

The month with the least sunshine in Ketchikan is December, with an average of 1h of sunshine.

UV index

January and December, with an average maximum UV index of 0, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to the Sun's UV rays for the ordinary person.
The average daily UV index of 0 transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in December in Ketchikan?

The average high-temperature, in December, in Ketchikan, is 39.9°F (4.4°C), while the average low-temperature is 30.9°F (-0.6°C).

How much does it rain in Ketchikan in December?

In December, in Ketchikan, the rain falls for 22 days. Throughout December, 15.6" (397.5mm) of precipitation is accumulated.

How much does it snow in Ketchikan in December?

During December, Ketchikan regularly aggregates up to 8.6" (218.4mm) of snow.

What is the ocean temperature in December in Ketchikan?

In Ketchikan, Alaska, in December, the average water temperature is 45.9°F (7.7°C). 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.

What is the month with the shortest days in Ketchikan?

With an average of 7.2h of daylight, December has the shortest days of the year.

How many hours of daylight does Ketchikan have in December?

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

What is the month with the least sunshine in Ketchikan?

With an average of 1h of sunshine, December has the least sunshine of the year in Ketchikan.

How many hours of sunshine does Ketchikan have in December?

In Ketchikan, Alaska, the average sunshine in December is 1h.

When is the lowest UV index in Ketchikan?

Months with the lowest UV index in Ketchikan are January and December, with an average maximum UV index of 0.

What is the UV index intensity in December in Ketchikan?

The average daily maximum UV index in December in Ketchikan, Alaska, is 0. 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 high temperature in December: 39.9°F

The warmest month (with the highest average high temperature) is August (64.5°F).
The month with the lowest average high temperature is January (38.4°F).

  • Average low temperature in December: 31°F

The month with the highest average low temperature is August (52.1°F).
The coldest month (with the lowest average low temperature) is January (28.8°F).

Average rainfall in December - Ketchikan, AK
  • Average rainfall in December: 15.7"

The wettest month (with the highest rainfall) is October (22.2").
Driest months (with the lowest rainfall) are June and July (7.4").

Average rainfall days in December - Ketchikan, AK
  • Average rainfall days in December: 22 days

The month with the highest number of rainy days is October (24 days).
The month with the lowest number of rainy days is July (15 days).

Average snowfall in December - Ketchikan, AK
  • Average snowfall in December: 8.6"

The month with the highest snowfall is January (13.3").
Months with the lowest snowfall are June, July, August and September (0").

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).

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 shortest days is December (Average daylight: 7.2h).

  • Average sunshine in December: 1h

The month with most sunshine is May (Average sunshine: 6h).
The month with least sunshine is December (Average sunshine: 1h).

Average UV index in December - Ketchikan, AK
  • Average UV index in December: 0

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January and December (UV index 0).