Unalaska
Alaska, USA
Long-term weather forecast
Long-term weather forecast
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December weather forecast and Climate
Unalaska, AK

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  • The average high temperature in December: 39°F

The warmest month (with the highest average high temperature) is August (58.9°F).
The month with the lowest average high temperature is January (36.8°F).

  • The average low temperature in December: 30.3°F

The month with the highest average low temperature is August (47.7°F).
The coldest month (with the lowest average low temperature) is February (27.6°F).

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  • The average rainfall in December: 7.9"

The wettest month (with the highest rainfall) is December (7.9").
The driest month (with the lowest rainfall) is July (2.2").

  • The average rainfall days in December: 23 days

Months with the highest number of rainy days are October, November and December (23 days).
The month with the lowest number of rainy days is July (13 days).

  • The average snowfall in December: 17.1"

The month with the highest snowfall is January (23.8").
Months with the lowest snowfall are June, July, August and September (0").

  • The average sea temperature in December: 41.5°F

The best month for swimming (with the highest average sea temperature) is August (50.1°F).
The coldest month (with the lowest average sea temperature) is February (38.8°F).

  • The average daylight in December: 7h

The month with the longest days is June (Average daylight: 17h).
The month with shortest days is December (Average daylight: 7h).

  • The average sunshine in December: 5h

Months with most sunshine are May and June (Average sunshine: 8h).
Months with least sunshine are November and December (Average sunshine: 5).

  • The 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).

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