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

December 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
  • Average high temperature in December: 1.2°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 December: -3.6°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 December: 82.8%

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 December: 148.3mm

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 December: 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 December: 396.2mm

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 December: 10 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 December: 6.3°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 December: 7h

The month with the longest days is June (Average daylight: 18h).
Months with shortest days are January and December (Average daylight: 7h).

  • Average sunshine in December: 1.3h

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 December: 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).

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