December weather forecast
Juneau, AK

Blooming fireweed in Juneau, Alaska with snowy mountain peaks in the distance
Blooming fireweed in Juneau, Alaska with snowy mountain peaks in the distance

Weather in December

The first month of the winter, December, is still a freezing cold month in Juneau, Alaska, with an average temperature varying between 25.7°F (-3.5°C) and 19°F (-7.2°C).

Temperature

The coldest months are January and December, with an average high-temperature of 25.7°F (-3.5°C).

Humidity

The average relative humidity in December is 90%.

Rainfall

In Juneau, Alaska, in December, during 5.8 rainfall days, 8.98" (228mm) of precipitation is typically accumulated. Throughout the year, in Juneau, Alaska, there are 172.4 rainfall days, and 85.87" (2181mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall in Juneau. December is the month with the most snowfall in Juneau. Snow falls for 21.8 days and accumulates 62.8" (1595mm) of snow.

Ocean temperature

In Juneau, the average seawater temperature in December is 43.3°F (6.3°C).
Note: 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.

Daylight

With an average of 6h and 31min of daylight, December has the shortest days of the year in Juneau.
On the first day of December in Juneau, sunrise is at 8:20 am and sunset at 3:13 pm. On the last day of the month, sunrise is at 8:45 am and sunset at 3:16 pm AKST.

Sunshine

In December, the average sunshine in Juneau is 2.9h.

UV index

January, April, October through December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 1 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always 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. A wide-brim hat offers excellent sun protection for the 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What are the coldest months in Juneau?

The coldest months are January and December, with an average high-temperature of 25.7°F (-3.5°C).

What is the average humidity in December in Juneau?

In Juneau, Alaska, the average relative humidity in December is 90%.

How many days does it rain in December in Juneau?

In Juneau, Alaska, in December, it is raining for 5.8 days, with typically 8.98" (228mm) of accumulated precipitation.

When does it snow the most in Juneau?

The month with the most snowfall in Juneau, Alaska, is December, when snow falls for 21.8 days and typically aggregates up to 62.8" (1595mm) of snow.

How many days does it snow in December in Juneau?

In Juneau, Alaska, in December, during 21.8 snowfall days, 62.8" (1595mm) of snow is typically accumulated.

What is the water temperature in December in Juneau?

In December, the average ocean temperature is 43.3°F (6.3°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 Juneau?

December has the shortest days of the year in Juneau, Alaska, with an average of 6h and 31min of daylight.

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

The average day length in December in Juneau is 6h and 31min.

What time are sunrise and sunset in December in Juneau?

On the first day of December in Juneau, Alaska, sunrise is at 8:20 am and sunset at 3:13 pm. On the last day of the month, sunrise is at 8:45 am and sunset at 3:16 pm AKST.

How many hours of sunshine does Juneau have in December?

The average sunshine duration in December is 2.9h.

When is the lowest UV index in Juneau?

The months with the lowest UV index are January, April, October through December, with an average maximum UV index of 1.

How high is the UV index in December in Juneau?

In Juneau, Alaska, the average daily maximum UV index in December is 1. A UV Index estimate of 2, and below, represents a minimal hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Juneau, AK

Average temperature in December - Juneau, AK
  • Average high temperature in December: 25.7°F

The warmest month (with the highest average high temperature) is July (55.8°F).
The months with the lowest average high temperature are January and December (25.7°F).

  • Average low temperature in December: 19°F

The month with the highest average low temperature is July (45.1°F).
The coldest month (with the lowest average low temperature) is February (17.1°F).

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Average pressure in December
Juneau, AK

Average pressure in December - Juneau, AK
  • Average pressure in December: 29.87"Hg

The month with the highest atmospheric pressure is July (30.03"Hg).
The month with the lowest atmospheric pressure is November (29.8"Hg).

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Average wind speed in December
Juneau, AK

Average wind speed in December - Juneau, AK
  • Average wind speed in December: 6.5mph

The windiest month (with the highest average wind speed) is January (6.9mph).
The calmest months (with the lowest average wind speed) are June and July (3.7mph).

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Average humidity in December
Juneau, AK

Average humidity in December - Juneau, AK
  • Average humidity in December: 90%

The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is May (86%).

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Average rainfall in December
Juneau, AK

Average rainfall in December - Juneau, AK
  • Average rainfall in December: 8.98"

The wettest month (with the highest rainfall) is October (9.88").
The driest month (with the least rainfall) is May (4.13").

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Average rainfall days in December
Juneau, AK

Average rainfall days in December - Juneau, AK
  • Average rainfall days in December: 5.8 days

The month with the highest number of rainy days is September (21.9 days).
The month with the least rainy days is February (4.8 days).

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Average snowfall in December
Juneau, AK

Average snowfall in December - Juneau, AK
  • Average snowfall in December: 62.8"

The month with the highest snowfall is December (62.8").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Juneau, AK

Average snowfall days in December - Juneau, AK
  • Average snowfall days in December: 21.8 days

The month with the highest number of snowfall days is January (21.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in December
Juneau, AK

Average sea temperature in December - Juneau, AK
  • Average sea temperature in December: 43.3°F

The best month for swimming (with the highest average sea temperature) is August (53.5°F).
The coldest month (with the lowest average sea temperature) is March (40.3°F).

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

Average daylight in December / Average sunshine in December - Juneau, AK
  • Average daylight in December: 6h and 31min

The month with the longest days is June (Average daylight: 18h and 9min).
The month with the shortest days is December (Average daylight: 6h and 31min).

  • Average sunshine in December: 2h and 54min

The month with the most sunshine is June (Average sunshine: 6h and 24min).
The month with the least sunshine is November (Average sunshine: 2h and 36min).

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Average sunshine days in December
Juneau, AK

Average sunshine days in December - Juneau, AK
  • Average sunshine days in December: 7.6 days

The month with the most sunshine days is May (10 days).
The month with the least sunshine days is November (6.1 days).

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Average UV index in December
Juneau, AK

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

The months with the highest UV index are May and July (UV index 3).
The months with the lowest UV index are January, April, October, November and December (UV index 1).

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Average cloud cover in December
Juneau, AK

Average cloud cover in December - Juneau, AK
  • Average cloud cover in December: 71

The months with the most cloud cover are January and November (Cloud cover 72).
The month with the least cloud cover is May (Cloud cover 61).

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Average visibility in December
Juneau, AK

Average visibility in December - Juneau, AK
  • Average visibility in December: 4mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).

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