January weather forecast and climate
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 January

January, the same as December, in Juneau, Alaska, is another subzero cold winter month, with average temperature varying between 18.7°F (-7.4°C) and 25.7°F (-3.5°C).

Temperature

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

Humidity

January is the most humid month, with an average relative humidity of 92%.

Rainfall

In January, the rain falls for 9.3 days. Throughout January, 9.76" (248mm) of precipitation is accumulated. Throughout the year, in Juneau, 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, during January, snow falls for 21.9 days and regularly aggregates up to 58.74" (1492mm) of snow. Throughout the year, there are 126.6 snowfall days, and 290.12" (7369mm) of snow is accumulated.

Ocean temperature

In Juneau, the average water temperature is 41°F (5°C).
Note: Swimming in 41°F (5°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 average length of the day in Juneau, Alaska, is 7.3h.

Sunshine

The average sunshine in Juneau is 2.8h.

UV index

January, April, October through December, with an average maximum UV index of 1, are months with the lowest UV index in Juneau. A UV Index value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 1 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Juneau?

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

What is the temperature in January in Juneau?

The average high-temperature, in January, is 25.7°F (-3.5°C), while the average low-temperature is 18.7°F (-7.4°C).

What is the most humid month in Juneau?

With an average relative humidity of 92%, January is the most humid month in Juneau, Alaska.

What is the average humidity in January in Juneau?

In January, the average relative humidity is 92%.

How much does it rain in Juneau in January?

In Juneau, Alaska, in January, during 9.3 rainfall days, 9.76" (248mm) of precipitation is typically accumulated.

How much does it snow in Juneau in January?

In Juneau, in January, snow falls for 21.9 days, with typically accumulated 58.74" (1492mm) of snow.

How cold is the water in January in Juneau?

In January, the average ocean temperature is 41°F (5°C). Swimming in 41°F (5°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Juneau have in January?

The average length of the day in January in Juneau, Alaska, is 7.3h.

How long on average sun shines in January in Juneau?

In Juneau, Alaska, the average sunshine in January is 2.8h.

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

Months with the lowest UV index in Juneau, Alaska, are January, April, October through December, with an average maximum UV index of 1.

How high is the UV index in January in Juneau?

The average daily maximum UV index in January in Juneau, Alaska, is 1. A UV Index reading of 2, and below, represents a low health threat from unprotected exposure to the UV radiation.

Average temperature in January
Juneau, AK

Average temperature in January - Juneau, AK
  • Average high temperature in January: -3.5°C

The warmest month (with the highest average high temperature) is July (13.2°C).
Months with the lowest average high temperature are January and December (-3.5°C).

  • Average low temperature in January: -7.4°C

The month with the highest average low temperature is July (7.3°C).
The coldest month (with the lowest average low temperature) is February (-8.3°C).

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Average pressure in January
Juneau, AK

Average pressure in January - Juneau, AK
  • Average pressure in January: 1011.1mbar

The month with the highest atmospheric pressure is July (1016.8mbar).
The month with the lowest atmospheric pressure is November (1009.1mbar).

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Average wind speed in January
Juneau, AK

Average wind speed in January - Juneau, AK
  • Average wind speed in January: 11.1km/h

The windiest month (with the highest average wind speed) is January (11.1km/h).
The calmest month (with the lowest average wind speed) is June (5.9km/h).

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Average humidity in January
Juneau, AK

Average humidity in January - Juneau, AK
  • Average humidity in January: 92%

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 January
Juneau, AK

Average rainfall in January - Juneau, AK
  • Average rainfall in January: 248mm

The wettest month (with the highest rainfall) is October (251mm).
The driest month (with the least rainfall) is May (105mm).

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Average rainfall days in January
Juneau, AK

Average rainfall days in January - Juneau, AK
  • Average rainfall days in January: 9.3 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 January
Juneau, AK

Average snowfall in January - Juneau, AK
  • Average snowfall in January: 1492mm

The month with the highest snowfall is December (1595mm).
Months with the least snowfall are June, July, August and September (0mm).

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Average snowfall days in January
Juneau, AK

Average snowfall days in January - Juneau, AK
  • Average snowfall days in January: 21.9 days

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

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Average sea temperature in January
Juneau, AK

Average sea temperature in January - Juneau, AK
  • Average sea temperature in January: 5°C

The best month for swimming (with the highest average sea temperature) is August (11.9°C).
The coldest month (with the lowest average sea temperature) is March (4.7°C).

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

Average daylight in January / Average sunshine in January - Juneau, AK
  • Average daylight in January: 7.3h

The month with the longest days is June (Average daylight: 18.2h).
The month with the shortest days is December (Average daylight: 6.5h).

  • Average sunshine in January: 2.8h

The month with the most sunshine is June (Average sunshine: 6.4h).
The month with the least sunshine is November (Average sunshine: 2.6h).

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Average sunshine days in January
Juneau, AK

Average sunshine days in January - Juneau, AK
  • Average sunshine days in January: 6.2 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 January
Juneau, AK

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

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

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Average cloud cover in January
Juneau, AK

Average cloud cover in January - Juneau, AK
  • Average cloud cover in January: 72

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 January
Juneau, AK

Average visibility in January - Juneau, AK
  • Average visibility in January: 6km

Months with the highest visibility are February, March, May, June, July, August, September, October and November (7km).
Months with the lowest visibility are January, April and December (6km).

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