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

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
January, the same as December, is another cold winter month in Juneau, Alaska, with average temperature varying between 23.7°F (-4.6°C) and 32.7°F (0.4°C).

Temperature

With an average high-temperature of 32.7°F (0.4°C) and an average low-temperature of 23.7°F (-4.6°C), January is the coldest month.

Humidity

In January, the average relative humidity in Juneau is 79.9%.

Rainfall

In Juneau, it is raining for 20.6 days, with typically 5.4" (135.9mm) of accumulated precipitation. Throughout the year, in Juneau, there are 229.8 rainfall days, and 62.3" (1581.6mm) of precipitation is accumulated.

Snowfall

January through April, October through December are months with snowfall in Juneau. January is the month with the most snowfall in Juneau. Snow falls for 10.6 days and accumulates 27.7" (703.6mm) of snow.

Ocean temperature

In Juneau, in January, the average water temperature is 41°F (5°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.

Daylight

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

Sunshine

In January, the average sunshine is 2.6h.

UV index

January, November and December, with an average maximum UV index of 0, are months with the lowest UV index in Juneau, Alaska. A UV Index reading of 2, and below, represents a low health risk from the exposure to the Sun's UV radiation for average individuals.
The average daily UV index of 0 in January transform into the following instructions:
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. 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.

What is the coldest month in Juneau?

With an average high-temperature of 32.7°F (0.4°C) and an average low-temperature of 23.7°F (-4.6°C), January is the coldest month in Juneau, Alaska.

What is the temperature in January in Juneau?

In January, in Juneau, Alaska, the average high-temperature is 32.7°F (0.4°C), and the average low-temperature is 23.7°F (-4.6°C).

What is the average humidity in January in Juneau?

In Juneau, the average relative humidity in January is 79.9%.

How many days does it rain in January in Juneau?

In January, in Juneau, the rain falls for 20.6 days. Throughout January, 5.4" (135.9mm) of precipitation is accumulated.

How much does it snow in Juneau in January?

In Juneau, in January, during 10.6 snowfall days, 27.7" (703.6mm) of snow is typically accumulated.

When does it snow the most in Juneau?

The month with the most snowfall in Juneau is January when snow falls for 10.6 days and typically aggregates up to 27.7" (703.6mm) of snow.

What is the ocean temperature in January in Juneau?

In January, the average ocean temperature in Juneau is 41°F (5°C). 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.

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

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

How many hours of sunshine does Juneau have in January?

In January, the average sunshine is 2.6h.

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

January, November and December, with an average maximum UV index of 0, are months with the lowest UV index in Juneau.

How high is the UV index in January in Juneau?

In Juneau, the average daily maximum UV index in January is 0. A UV Index of 2, and less, symbolizes a minimal hazard to health from unprotected exposure to the UV radiation.
Average temperature in January - Juneau, AK
  • Average high temperature in January: 0.4°C

The warmest month (with the highest average high temperature) is July (17.7°C).
The month with the lowest average high temperature is January (0.4°C).

  • Average low temperature in January: -4.6°C

The month with the highest average low temperature is July (10°C).
The coldest month (with the lowest average low temperature) is January (-4.6°C).

Average humidity in January - Juneau, AK
  • Average humidity in January: 79.9%

The month with the highest relative humidity is September (87.9%).
The month with the lowest relative humidity is May (76.3%).

Average rainfall in January - Juneau, AK
  • Average rainfall in January: 135.9mm

The wettest month (with the highest rainfall) is September (219.5mm).
The driest month (with the lowest rainfall) is April (74.7mm).

Average rainfall days in January - Juneau, AK
  • Average rainfall days in January: 20.6 days

The month with the highest number of rainy days is October (23.9 days).
The month with the lowest number of rainy days is June (15.8 days).

Average snowfall in January - Juneau, AK
  • Average snowfall in January: 703.6mm

The month with the highest snowfall is January (703.6mm).
Months with the lowest snowfall are May, June, July, August and September (0mm).

Average snowfall days in January - Juneau, AK
  • Average snowfall days in January: 10.6 days

The month with the highest number of snowfall days is January (10.6 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

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).

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 shortest days is December (Average daylight: 6.5h).

  • Average sunshine in January: 2.6h

The month with most sunshine is May (Average sunshine: 7.5h).
The month with least sunshine is December (Average sunshine: 1.3h).

Average UV index in January - Juneau, AK
  • Average UV index in January: 0

Months with the highest UV index are June and July (UV index 5).
Months with the lowest UV index are January, November and December (UV index 0).