December weather forecast
Gustavus, AK

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Brown sand and water on a section of the Gustavus Beach, Alaska, and snow-peaked mountains in the far view
Brown sand and water on a section of the Gustavus Beach, Alaska, and snow-peaked mountains in the far view

Weather in December

In December, Gustavus wraps up the year with a return to its winter glory. The snowfall hits a high with 11.18" (284mm), occurring on almost 12 days. The city is once again transformed into a snow capped paradise, living up to Alaska's reputation for snow. As the temperature continues to drop, the daylight hours are shortest in December, suggesting the winter solstice. The festivities along with the snowy weather make December a month worth remembering in Gustavus.

Temperature

December's onset in Gustavus sees an average high-temperature of a subzero cold 31.8°F (-0.1°C), exhibiting a slight fluctuation from the previous month. Gustavus maintains an average low-temperature of 27.3°F (-2.6°C) throughout December's nights.

Humidity

In December, the average relative humidity is 87%.

Rainfall

In Gustavus, Alaska, during December, the rain falls for 12.8 days and regularly aggregates up to 3.58" (91mm) of precipitation. In Gustavus, during the entire year, the rain falls for 182.7 days and collects up to 37.4" (950mm) of precipitation.

Snowfall

Months with snowfall in Gustavus are January through April, October through December. In Gustavus, Alaska, in December, snow falls for 11.9 days, with typically accumulated 11.18" (284mm) of snow. Throughout the year, there are 60.8 snowfall days, and 53.78" (1366mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 6h and 30min of daylight.
On the first day of the month, sunrise is at 8:27 am and sunset at 3:17 pm. On the last day of December, in Gustavus, sunrise is at 8:51 am and sunset at 3:21 pm AKST.

Sunshine

January and December, with an average of 2.9h of sunshine, are months with the least sunshine in Gustavus, Alaska.

UV index

November and December, with an average maximum UV index of 1, are months with the lowest UV index in Gustavus. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 1 in December interprets into the following advice:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
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Frequently asked questions

How cold is December in Gustavus?

An average high-temperature, in December, in Gustavus, is 31.8°F (-0.1°C) and the average low-temperature is 27.3°F (-2.6°C).

What is the average humidity in December in Gustavus?

The average relative humidity in December is 87%.

How many days does it rain in December in Gustavus?

In December, in Gustavus, the rain falls for 12.8 days. Throughout December, 3.58" (91mm) of precipitation is accumulated.

How many days does it snow in December in Gustavus?

In December, in Gustavus, Alaska, it is snowing for 11.9 days. Throughout December, 11.18" (284mm) of snow is accumulated.

What is the month with the shortest days in Gustavus?

December has the shortest days of the year in Gustavus, Alaska, with an average of 6h and 30min of daylight.

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

In Gustavus, Alaska, the average day length in December is 6h and 29min.

When are sunrise and sunset in December in Gustavus?

In December, on the first day of the month, sunrise is at 8:27 am and sunset at 3:17 pm. On the last day of the month, in Gustavus, sunrise is at 8:51 am and sunset at 3:21 pm AKST.

What are the months with the least sunshine in Gustavus?

The months with the least sunshine are January and December, with an average of 2.9h of sunshine.

How long on average sun shines in December in Gustavus?

In Gustavus, the average sunshine duration in December is 2.9h.

What are the months with the lowest UV index in Gustavus?

The months with the lowest UV index in Gustavus are November and December, with an average maximum UV index of 1.

How high is the UV index in December in Gustavus?

In December, the average daily maximum UV index in Gustavus, Alaska, is 1. A UV Index reading of 2, and below, represents a low health threat from unsafe exposure to Sun's UV rays.
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
Gustavus, AK

Average temperature in December - Gustavus, AK
  • Average high temperature in December: 31.8°F

The warmest month (with the highest average high temperature) is July (57.2°F).
The month with the lowest average high temperature is January (30.7°F).

  • Average low temperature in December: 27.3°F

The month with the highest average low temperature is July (49.5°F).
The coldest month (with the lowest average low temperature) is February (25.9°F).

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Average pressure in December
Gustavus, AK

Average pressure in December - Gustavus, AK
  • Average pressure in December: 29.83"Hg

The month with the highest atmospheric pressure is July (30.03"Hg).
The month with the lowest atmospheric pressure is November (29.77"Hg).

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Average wind speed in December
Gustavus, AK

Average wind speed in December - Gustavus, AK
  • Average wind speed in December: 6.8mph

The windiest month (with the highest average wind speed) is January (7mph).
The calmest months (with the lowest average wind speed) are June and July (3.7mph).

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Average humidity in December
Gustavus, AK

Average humidity in December - Gustavus, AK
  • Average humidity in December: 87%

The month with the highest relative humidity is August (90%).
The month with the lowest relative humidity is November (84%).

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Average rainfall in December
Gustavus, AK

Average rainfall in December - Gustavus, AK
  • Average rainfall in December: 3.58"

The wettest months (with the highest rainfall) are October and November (4.21").
The driest month (with the least rainfall) is May (1.61").

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Average rainfall days in December
Gustavus, AK

Average rainfall days in December - Gustavus, AK
  • Average rainfall days in December: 12.8 days

The month with the highest number of rainy days is June (18.9 days).
The month with the least rainy days is February (8.2 days).

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Average snowfall in December
Gustavus, AK

Average snowfall in December - Gustavus, AK
  • Average snowfall in December: 11.18"

The month with the highest snowfall is January (11.22").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Gustavus, AK

Average snowfall days in December - Gustavus, AK
  • Average snowfall days in December: 11.9 days

The month with the highest number of snowfall days is March (13.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Gustavus, AK
  • Average daylight in December: 6h and 3min

The month with the longest days is June (Average daylight: 18h and 12min).
The month with the shortest days is December (Average daylight: 6h and 30min).

  • Average sunshine in December: 2h and 5min

The month with the most sunshine is June (Average sunshine: 7h and 42min).
The months with the least sunshine are January and December (Average sunshine: 2h and 54min).

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Average sunshine days in December
Gustavus, AK

Average sunshine days in December - Gustavus, AK
  • Average sunshine days in December: 10.5 days

The months with the most sunshine days are February and May (12.5 days).
The month with the least sunshine days is June (7.7 days).

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Average UV index in December
Gustavus, AK

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

The month with the highest UV index is July (UV index 4).
The months with the lowest UV index are November and December (UV index 1).

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Average cloud cover in December
Gustavus, AK

Average cloud cover in December - Gustavus, AK
  • Average cloud cover in December: 70

The month with the most cloud cover is November (Cloud cover 71).
The month with the least cloud cover is May (Cloud cover 56).

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Average visibility in December
Gustavus, AK

Average visibility in December - Gustavus, AK
  • Average visibility in December: 5mi

The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (5mi).
The months with the lowest visibility are July and August (4mi).

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Gustavus, Alaska, USA

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